These petitions are limited in scope for a reason - this is a small initiative and the goal is to focus on one part of the market which started the whole thing (the initiative, not the software killing issue), as well as to limit the number of big companies that could be affected (the potential opposition).
Sure, ideally this would expand on all software but you have to start somewhere, especially when you’re just a bunch of randos with little knowledge about law and no funds to turn it into a serious lobbying movement - one that could both get the political attention and was able to defend its stance from corporations.
I’ve been using Tuta since 2016, on paid plan since 2019.
Outside a single longer outage early on I had nothing but good experience with their service. Granted, I only care about email and calendar (the only two products they have at the moment) but both work without any issues.