The announcements that they were going to charge for API access was in April. https://www.redditinc.com/blog/2023apiupdates . Mature content being restricted was mentioned in https://www.reddit.com/r/reddit/comments/12qwagm/an_update_r... and in https://www.reddit.com/r/apolloapp/comments/12ram0f/had_a_fe... it was stated that Imgur also banned sexually explicit uploads the same day.

While "yes, that was April, the law wasn't signed until May", it passed 96-0 ( https://legiscan.com/VA/votes/SB1515/2023 ) in February and the recommendations from the Governor to change it was rejected on April 12th.

The timeline of when that switchover would happen was at the end of May when 3rd party developers said that they wouldn't be able to continue past June 30th.

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I don't believe that the change was "Virginia Law -> do all these things" but rather "these things are in motion... Virginia Law -> several of these things in motion must be done by July 1."