> I know people are building these the questions is for what, CI/CD for ARM like others mentioned is plausible but only if you are targeting the Pi or something very similar just due to how “fragmented” the ARM ecosystem is with its multiple uArchs.

I don't understand what point you tried to make. These hosting services, and also clients, are quite intentionally targetting the raspberry pi. More specifically, they do target Debian running on Raspberry Pi. I don't understand the confusion. I mean, is it also hard to understand why AWS users pay for ARM instances running Amazon's custom linux distro? In both the Pi and Graviton you can run nginx, nodejs, Python, ssh... So, what's the problem again?