The person who posted the story did!

Their comments had a whole second plot line about how all of their email accounts were closed so they had to create a ProtonMail account to sign up for new websites but websites weren’t accepting it:

> My daughter was having a breakdown in Scotland because her dissertation is due in 7 weeks. I tried to book a flight to see her and realised I couldn't do that without an email address.

> I had to create a Proton Mail account and almost no websites believe that it's genuine and block me from signing up.

Another inconsistency is that Protonmail actually locks new accounts that immediately try to sign up for popular external services, which is something they would have discovered if they tried what they said.

I know you’re desperate for reasons to believe the deleted Reddit story and discredit me, but you’re the one coming up with explanations that disagree with the story posted. I’m using the information the person claimed, not my own assumptions