I stopped clicking on techcrunch links a long time ago for same reason. I am pretty sure that wall is not GDPR compliant, because the way to opt-out is not simple and straightforward.
And of course, GDPR is all about opt-in, not opt-out. The only statement that applies to opting out is 'withdrawing consent shall be as easy as granting it', which of course applies only after you've intentionally, explicitly granted opt-in consent.
