I think that coincided with them removing phone number verification for accounts. Probably due to my browser looking unusual (content blocker, linux user-agent string, other addons) any time I set up a new account and used it for a few minutes a few years ago, it'd lock the account and redirect every logged in page to one demanding SMS verification to unlock the account.

I would usually get support to manually unlock it after a few days by emailing them and mentioning why I didn't want to give them a phone number. Now the process only involves solving captchas. (and maybe some hidden waiting)