Yes it cost money, but it has always done so, and for everybody, not just WPE. And Automatic has known since the beginning that there were competitors reliant on that access. But so far, it has chosen ignore it and eat the cost as part of its business, and it still does for everybody but WPE. That's what is a problem.
Automattic, two t's because as we've discovered from this mess Matt Mullenweg IS every part of WordPress including his "personal website" wordpress.org and his effective control of the useless 501(c)(3) foundation, according to their request for a bond from WPE for the injunction, spends $800,000 per year for the entire community
Automattic and Matt asked for a bond of twice that amount, in case WPE eventually loses the case and should be charged for the period from the preliminary injunction to the end of the case. In the absence of evidence submitted by them on the "marginal" cost of supporting WPE:
the Court finds that any harm to Defendants resulting from the issuance of preliminary injunctive relief is unlikely, as it merely requires them to revert to business as usual as of September 20, 2024. Accordingly, the Court declines to require WPEngine to post a bond.
See pages 39-40 in what's currently the bottom entry. It's not much money, and given that WPE was forced into scraping wordpress.org to find updates of the plugins its customers used, WordPress may well end up spending less after the reversion. If they have been using and/or selling the information default Wordpress regularly phones home, which was used to create the now banned wordpressenginetracker.com .csv file, they might even come out ahead.
Given that Matt hardwired the entire community to get updates from wordpress.org and successfully fought the creation of any official mirrors, it's very debatable this is a real problem except in Matt's rage quitting mind.