Apparently it works with Find My as well. I wouldn't be surprised if they started rolling out premium features that take more bandwidth once everybody's free two years expires.
Unfortunately GlobalStar is probably one of the worst satellite constellations out there (that I know of at least) for actual communication (SPOT devices used or still use GlobalStar and are famously crap compared to Garmin inReach on Iridium). Of course it could be improved and they do have the bandwith licenses which is important.