Does this run on x86/64 bit systems? Or this is for Linux smartphones more.

One idea is perhaps to have more than one device? A tablet at home could be used in some scenarios, the rooted phone for some others. Maybe you have an old device laying around?

Here’s how I build my own images. More details are in the repo, feel free to re-use https://gitlab.com/olof-nord/selfhosted/-/blob/main/images/Makefile

Only unstable, right?

I should say as well, postgres, mariadb and memcached all support riscv, you just got to build it yourself. I have found the riscv64 ubuntu docker images useful as well to use as a base - for example the riscv64/ubuntu one.

I do! Since a while I selfhost with my risc-v Unmatched board. There are prebuilt Ubuntu Server images available. Its mainly for software which you have the source code for, and are willing to build from source. I’ve made use of docker buildx for cross cmpilation a fair bit as well. Go and Rust has good support. A good start can be to check out the riscv-bringup repo from carlosedp. Its definitely early days though, you need to be pretty motivated. Debian support is scheduled for next year AFAIK.

So, what do I actually use it for? nginx + tailscale so far

I would also say this. Njalla is good

Tailscale maybe? They have a mode where you can configure a site to site links, you could route the docker networks. https://tailscale.com/kb/1019/subnets

My vote goes to Mullvad. Possibly Proton VPN as a second contender.

+1 for Organic Maps. Create an open streetmap account and contribute - its a game changer for me. Instead of a consumer, you’re a contributor. (That goes for all OSM ofc)

Yes. I use QKSMS for text messages now instead.