You can migrate away from them if you ever want to.
If you self host instead, make sure your server is on its own vlan. Servers are a target for exploitation, and you don’t want the rest of your home devices exposed if your server is compromised.
Note: A Pi probably has the CPU power, but the caching from the server may be more space than an SD card will hold.
Why does @firefox have to keep profiles hidden in "about:profiles" like they're illegal to have. It's quite literally the 1 feature stopping me from using it over Vivaldi. That and vertical tabs, of course