In our post here we talk about the criteria used, how developers can check their page’s status, and how they can appeal if they think a restriction has been unfairly applied to their page: https://itch.io/t/5133739/our-update-on-the-uk-online-safety-act
Thank you. This is helpful, especially the tags affected, the Geo-Restrictions tab, and the link to the petition.
I would add that the OSA bans not only porn but also "content that encourages, promotes, or provides instructions for either: self-harm, eating disorders or suicide". How one differentiates between "mentions" and "promotes" is not obvious. https://www.gov.uk/government/publications/online-safety-act-explainer/online-safety-act-explainer#types-of-content-the-act-tackles .
While I do hope that this act will be repealed, I believe the users should be ready to work around it in the meantime.