Absolutely. Fdroid is awesome.

I hate the fact that there’s no simple, free, ad-free note-taking app either inbuilt or on the app store. Just something simple and local to take a quick shopping list or a name or something like that. Fdroid has me covered for that.

It would kind of add to them in a way if you post from your instance or sub from your instance solo

Is this actually true? As far as I understand it, by far the biggest overhead is users browsing. The fewer users you have actually hitting the frontend, the better.