For me, it's not image viewers, but websites that take photo uploads. None of them that I've ever used have supported webp, so I always have to convert to png or jpg.

I wholeheartedly agree. I'm a technical person, I run Linux as my primary OS and use FOSS software. But I also have a full time job and 2 small kids, and frankly I just don't have the time or patience to be a full time sysadmin. Proton has come a long way in providing alternatives to Gmail, GCalendar, GDrive, etc., but like you said if you want to replace ALL of Google you practically have to self host a gazillion Nextcloud instances or whatever.

It's St. Edward's Church in Stow-on-the-Wold, England

I found that even with AdGuard DNS enabled, I still saw promoted posts (ads) using the Reddit app, so I deleted it.