My wife recently got a murena Teracube and we have rather mixed feelings about it so far, worst problem is very poor mobile network connectivity. E.g. when leaving WiFi range, it doesn’t autoconnect to mobile, or no connectivity after crossing the borders (I checked the bands, they are fine). But here I’m not sure if the problem is hard or software. Another annoying problem is that I can’t get owntracks run properly. On my Fairphone 4 (FF OS, so still Google Brand) I never had those issues.
FOSS is free and open source software, which is free to use and it’s source code is disclosed and allowed to used to variable extend, often (definitely not always) owned by private people or non profit organizations. “Just” freeware is usually used for proprietory software, which is free to use, but undisclosed source, so nobody can look under the hood and see what it actually does.