Fair enough - all I can say is that I’ve never personally encountered one of those sites, despite having signed up for things with Protonmail exclusively for over 5 years now.

Lemmy (and formerly reddit) aside, I don’t use social media - but even if I did, I’m not sure I’d notice the restrictions you mention without an unrestricted point of reference.

The Lenovo point is interesting - I don’t have a Lenovo account, but I do use Thinkpads, so I may need one eventually.

I have somewhere on the order of 80 accounts on as many websites registered to Protonmail accounts, and I’ve never once had a website turn me away for the @protonmail.com domain. I exclusively use that domain. I can only remember one specific instance where they had downtime, too - overall they’ve been very reliable.

I did once have some of my protonmail accounts closed for suspicious activity, multiple years ago - but in their defense I was being pretty suspicious. I emailed support from my main account, explained the situation, and they unlocked the accounts for me - never had an issue since.