I'm kinda used to that and accepted that, apparently, I will never use Facebook, Instagram, Twitter or Google account because of that. Whatever, I don't care. What was really infuriating, though, is when PayPal asked me to enter my phone "to make my account even safer". Fuck them, but having problems with PayPal is quite a bit more annoying than being unable to use some social media bullshit.
For twitter I just favorite the few people I want to follow.
Surprisingly my instagram account has no personal information and haven't had any issues but I don't know why.
however, i managed to unlock it somehow, first i sent them a trouble ticket asking why i could not tweet anymore (which immediately got me an email that said my account was locked for "suspicious activity" and that i needed to confirm my identity with phone number), then i requested all the data they had on me through the profile options, waited 3 days for them to do the archive then when i logged back in to download it they would only ask for a recaptcha challenge to unlock my account
perhaps they consider bots unable to request gdpr data ?
they let me create an account and then locked it and wanted to know my phone number before they would unlock it. I can't even go delete it without giving them personal information.