I just ran Power Delete Suite on all of my comments and self posts, stating they have been removed in protest.
On July 1st, I am deleting every comment and post, then closing my account. Reddit was fun while it lasted.
The fediverse is still raw, but I see massive protentional here, and I am ready for this journey with all of you.
Do you live in Europe? Perhaps you can request the Right to be Forgotten (GDPR). If a lot of European do it, that might pressure Reddit.
Not sure whether that helps. If there is no critical mass they can just say “F… you”.