California has no business trying to regulate what sites on the Internet can/can't do. For that matter, neither do national governments.
Let's say I operate a site similar to IMDb, from here in Texas or some freewheeling island country somewhere. If California (or Germany, or Russia, or whereever) tries to regulate the content of that site, I will cheerily ignore them. They have no jurisdiction.
They're quite welcome to block my site, if they can get their ISPs to cooperate. But it's BS to specify what websites can/can't show.
Now, maybe IMDb operates out of California, so that's where "jurisdiction" comes in. If that's the case, IMDb needs to move the site (& dba location, but not necessarily office/staff location) out of state. Too bad, CA, you just regulated a business out of your state entirely!