I think there's a "Sign up with email" link on Twitter. Though of course, every time I created a new account there it was quickly blocked, only allowing me to

I think there's a "Sign up with email" link on Twitter. Though of course, every time I created a new account there it was quickly blocked, only allowing me to unblock it by providing a phone number. That might have to do with a number of privacy-enhancing browser extensions I've got installed. That said, thanks to GDPR, I'm relatively confident that they've actually deleted my phone number when I asked them to after verification.