Another comment by Peterson: https://safereddit.com/r/ProtonVPN/comments/1vhcp0c/proton_vpn_charges_more_when_using_safari_vs/p2qh8wl/#p2qh8wl

This topic went very strange very fast - so let me expand and clarify:

Proton VPN is $9.99 per month or $83.88 per year. We used to have an introductory offer for two years at $4.49 per month. There had been a 2-year intro price of $2.99 per month that had been running for a while on some back-to-back campaigns. That price ended at the end of July, and since then it has been $3.49 per month.

As mentioned above, the $2.77 and $3.23 price points in the screenshots were an unintentional calculation error that should have been fixed on Friday.

At the end of a long-standing sale period, we often try an A/B run of the old and new pricing on the website during the transition to see if anything has changed. As explained to answer the speculation on the Reddit post (and as confirmed by others who independently checked it) there is no "adaptive pricing" - it does not vary by browser, OS, etc and is 100% randomised.

So for the past several days some people will still have seen the old cheaper $2.99 price. I had been of the impression that the A/B was already concluded and there must have been some caching going on, but it is actually due to end on Monday, when 100% of people should be seeing the $3.49 intro price.

There was no denial that we were doing an A/B evaluation of maintaining the lower price - even though it would not have been sustainable to keep the $2.99 price point going in the longer term. Indeed, on Friday I had confirmed to someone commenting on the original post that it was indeed a simple A/B that they were seeing. Unhelpfully, my reply there turns out to have been automodded for linking back to the r/ProtonVPN thread.

Thanks for the info. Before contacting them I had the idea of disabling the play integrity API for the app to see what would happen, and sure enough once I disabled it I was able to login again.

How did you get greenfi working, call/email them? It used to work for me on graphene until fairly recently.

Glad I ditched Fedora a while ago.