Seen a few posts on this and thought I'd put in my two cents.
Whilst it's correct that tumblr has no control over the ID thing, what they do have control over is their mature content filters. If you weren't before, now is the time to get really fucking insistent that they fix their extremely broken mature content filters.
The combination of the new ID verification requirements, and the extremely janky mature content filters, means that tumblr is now unusable for me. Any posts that get tagged in error as mature will be completely blocked out, and I won't be able to see them.
It would be helpful if you had a function that allows the userbase to report incorrectly applied maturity filters for staff to remove, so that I can continue to enjoy my favourite site. Otherwise, I will be forced to leave the site until the ID legislation in my country is repealed/reversed."
Ta-da! That easy. Feel free to copy that text if you want. Feel free to mention you won't be going through ID verification due to concerns about the security of your data. Expand on it however you want, I'm not your parent.
But this is an opportunity to present a solution to something that's been pissing us off for a while now, and it gives us, the userbase, a better opportunity to combat report bombing of trans folks and black folks. I think we're morally obligated to push for this.
We got the reblogs rolled back. Time to leverage that unity for this as well.