Back when rooting was all the rage I tinkered with hosting various services. It just didn’t make much sense for such an underpowered device, amongst other reasons (battery swelling).
I did use an old phone to “host” a game automation. One of those “idle clicker” / RPG games since I’m so lazy. After about 2 months the battery swelled and popped the back cover off. That was the end to that idea…
I think showing tracker info is still a good, insightful thing. Sure, giving an impression one piece of software is better than another because it has less trackers is a bad thing. Users that care about functionality will vet apps on that regard, same with security and privacy conscious users. Some users just like the app to be pretty, and if they ignore everything else but make a decision based in tracker count, all the better in the long run.