You could use Firefox on mobile and use ublock origin to auto-block images & third-party content by default, then it doesn’t use almost any bandwidth. I’d imagine jerboa uses similar amounts since it also displays images without any data saver settings as I can see.
lemmy.ml is on 0.18 so jerboa 0.34 doesn’t work with it, only 0.35. Shouldn’t crash but well…
Honestly I’d suggest using the browser, the web interface works perfectly well on mobile. If you use Firefox or any other browser that can install UserScripts, you can add some useful ones like https://greasyfork.org/en/scripts/469273-lemmy-rewrite-links-to-home-instance and https://greasyfork.org/en/scripts/469196-gm-lemmy-newtab
Dadurch, dass Leute, die auf dem Poll voten, nicht aus der gleichen Region kommen, wird das Ergebnis wahrscheinlich doch relativ repräsentativ werden.
It only really matters for the “local” feed which instance you choose. I don’t really see much point to that one honestly, except if you’re on something like startrek.website where “local” is “show me all star trek stuff”, or something similar.
And yes, it is important to spread out the user base across multiple servers and not all end up on lemmy.world.
So I’d say find some smaller instance, maybe with a community actually physically local to you, and make that your main one. Or don’t and stay on lemmy.world, I’m not your dad.
Perpetual plug to my userscript which changes all links to point to your home instance to make this even easier :)