The push notifications would be a issue for me. I am using GrapheneOS without any google services.
Also the calendar i am not 100% sure how I want to do it. I currently use Nextcloud and Caldav. Which for me works great when syncing with Etar on my phone and Evolution mail in the desktop. For my dad I have setup caldavsynchronizer for outlook as that is the email client he has used for years. When i would use Tuta id loose the nextcloud calendar because it can in no way synchronize with Tuta. With proton on the other hand I can use the bride for email and use the calendar how i am currently using it together with Etar on the phone.
On the other hand if say Tuta providers a calendar that is integrated and works with both the email client on the desktop and on the phone. the same goal is accomplished.
It was never so much about the hate for GOS as it was for Daniel. Daniel is a absolute genius but has some mental and paranoid issues. Which hurt GOS reputation in the proces, Dont get me wrong I do not hate the guy or GOS at all but I do agree Daniel has some serious issues.
I ise about the same. But that is more due to the hardware I got being a bit older. 2 dell R710s 1 R510 and a custom build server. Everything is still 1g. In my case electricity is not a big deal due to solar. We produce much more then we can use our self.
Well proton has been accused of being a honeypot as well.