I prefer the opposite. I want the best quality I can get often 4K remux. Storage is cheap nowadays and I don't mind waiting a few days for a movie to download. Also I do have a 500/500 connection which helps.
The official site is best to get started. Personally i find it the most easy to run a container and configure a secondary Firefox profile:
https://geti2p.net/en/
Just search protonmail honeypot and you get many results. I am not saying it is true. Just saying because a company gets accused of something doesn't make it true.
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.
Might want to change the title a bit...