tumblr just added an update that requires you to verify your age in order to view "mature content". I'm not sure how they do the verification (haven't yet checked), but given recent similar updates from things like Discord, it most likely involves sending them a photo of either your face or your ID.
In addition, over the past few months, and also years in the long-term, tumblr has been incorrectly marking things as mature content. These include:
Notifications about missing persons and requests for help
Posts about youth liberation
Posts about sex education
Posts about how the mature content is poorly implemented
Posts about being trans, more specifically about trans women and transmisogyny by both tumblr and users on tumblr
Non-sexual selfies by trans women/transfems
Trans womens'/transefems' ENTIRE BLOGS even if the blog contains no sexual content
Reblogs made by various blogs, mostly trans women, which add no additional content but somehow are marked as containing mature content, when the original post is not
Posts talking about racism and antiblackness both on and off tumblr
Posts by black people, especially black trans people, that are non-sexual
And likely many more I haven't seen
In essence, this update has mandated that a majority of users (within the UK and Brazil) must either a) submit their personal information to tumblr, a website whose moderation has been EXTREMELY biased against marginalised people and who I would not trust with my ID, or b) be excluded from absolutely all conversations tumblr decides are "mature content", whether they are actually sexual in nature or not. Furthermore, anyone not over 18 will also not be allowed to take part in these conversations, or even see them, or interact with many trans women or people of colour on this site, as tumblr decides.
This update is complete bullshit designed to censor and exclude marginalised people, poorly hidden under a guise of "protecting teenagers from sexual content", and they know it.
EDIT: This update apparently only affects users in the UK or Brazil, like me. This is still bullshit even if it's just some people.
gracieabrams
blakekathryn
ellievsbear
tangentwithtanner
