I wrongly thought the new OSA only applied to adult content. My 17yo DD has discovered she can't access Reddits that she has been using to support her self harming and eating disorder recovery - not Reddits that encourage these behaviours, but the opposite.
She's incredibly isolated due to her mental health struggles, hasn't been in school for 2.5 years, and online communities have been her lifeline - knowing there are others like her and learning how they've regained control has been more helpful than anything CAMHS has offered so far.