JUST IN - ProtonMail users are outraged as the email service has reportedly started using Google's reCAPTCHA to "secure" logins, but potentially compromising users' identities in the process.

UPDATE -

@ProtonMail

has shared clarifying information and says Google's reCAPTCHA is in the process of being phased out again:

https://news.ycombinator.com/item?id=27326961