From the SENATE COMMITTEE ON BUSINESS, PROFESSIONS AND ECONOMIC DEVELOPMENT (https://leginfo.legislature.ca.gov/faces/billAnalysisClient.xhtml?bill_id=202520260AB1921):
The bill would create new obligations that are technically challenging, commercially impractical, and inconsistent with conclusions reached by policymakers in the United Kingdom and the European Union. Mandating patches, offline versions, community-server functionality, or refunds in all circumstances is unworkable. Requiring publishers to modify, reproduce, or distribute their games after support has ended interferes with rights protected under federal copyright law, while blanket refund requirements fail to account for the value consumers may already have received through months or years of gameplay.
That implies a bit more burden than the bill actually requires. From AB-1921 digest (https://leginfo.legislature.ca.gov/faces/billTextClient.xhtml?bill_id=202520260AB1921):
The bill would, beginning on the date an operator ceases to provide services necessary for the ordinary use of the game, require the operator to provide the purchaser with, among other things, an alternate version of, a patch or update to, or a refund for, the game, as provided, and prohibit the operator from selling, leasing, or otherwise distributing a version of the game that cannot be used by a purchaser independent of services controlled by the operator. The bill would authorize the Attorney General or a district attorney to bring a civil action for a violation of these provisions.
From the bill language:
(2) Beginning on the date a digital game operator ceases to provide services necessary for the ordinary use of the digital game, the operator shall provide the purchaser with one or more of the following:
(A) A version of the digital game that can be used by the purchaser independent of services controlled by the operator.
(B) A patch or update to the purchaser’s version of the digital game that enables its continued use independent of services controlled by the operator.
(C) A refund in an amount equal to the highest price of the digital game offered by the digital game operator within the 12 months before the digital game operator ceases providing services necessary for the ordinary use of the digital game.
(D) All necessary documentation to allow the purchaser to host a private or community server with which the purchaser could make ordinary use of the game independent of services controlled by the operator.
(E)
(i) Subject to clause (ii), a version of server software that the game may connect to in order to make ordinary use of the game independent of other ongoing services.
(ii) If the server software contains additional hardware or software requirements than what was necessary for the original game, clause (i) shall apply only if the operator has communicated that fact to the purchaser and the additional hardware or software requirements are reasonably attainable at the time services by the digital operator cease.
The committee analysis greatly exaggerates the requirements, but the objections are still at least somewhat valid. If a company (imagine a developer-owner, one-man show) stops hosting the only live server for a game because he's taking care of an ill spouse, why should he be obligated to make significant software modifications, host those patches, or create documentation instructing how to create and host a the game via a private server. And if he doesn't do so, then he has to refund everyone at the HIGHEST PRICE for which the game has sold in the last 12 months?
This bill was written like it was intended to stick it to EA or Blizzard, so that didn't help.
Lastly, and certainly not least, the part authorizing the State Attorney General to take legal action on violating developers was just ill-advised in this legislative session. You see, the California Legislature has a rule that no bill that could cost the State more than $100,000 should move through the process without exceptional circumstance. The cost for the State Attorney General to take on dozens of "dead video game cases" would put the bill's price tag way over that threshold.
The bill was asking too much in today's modern financial contexts and might have been asking for too much to start with.
A BETTER bill would have been simple: "The IP-holder of a video game that ceases distribution/hosting ALSO relinquishes both liability and control over software replication and hosting." Basically, if you abandon something, it goes into a special licensing phase wherein other people can replicate it and re-distribute it, but they're not authorized to draw a profit from those actions.