I believe the google framework is installed with less privilege than a system application

I was under the impression you could use microG instead of google services as well if you installed it manually?

Dell optiplex desktop or workstation would def be a gpod idea. Both are much quieter than servers - you can get the workstation if you want a xeon chip and ecc memory - otherwise the desktop will likely do what you need.

Oops!

Look into PICO PSU. Its a small powersupply that uses a power brick to downsize internals. It’s used by homelabbers sometimes.

If Tidal isn’t your cup of tea, check out Qobuz - I’ve had a better experience with it. It doesn’t pay artists as well as spotify, but I think it’s still more than Spotify (iirc)