alt Hacker NewsThe Online Safety Act is clear-cut censorship but that's not why Imgur left the UK. They were facing fines for violating the UKs data protection laws, specifically a set of rules that were introduced years before the OSA was even passed. Their parent company hasn't pulled any of their other services from the UK either, which you'd expect them to do if their goal was to protest or avoid the OSA.
... in regard of age checks, yes?
https://www.bbc.com/news/articles/c4gzxv5gy3qo
If you follow the links to earlier articles you get to this one about fining TikTok: https://www.bbc.com/news/uk-65175902
"There are laws in place to make sure our children are as safe in the digital world as they are in the physical world. TikTok did not abide by those laws." ... "When you sign up you can be targeted for advertising, you can be profiled, your data contributes to an algorithm which feeds content," said the Information Commissioner.
So even before the OSA, the idea was: social media sites using algorithmic feeds must prevent children's access, and just asking "are you over 13" isn't enough. That's a demand for age verification, in practice.