I believe this doesn’t apply to the Linux kernel. I mean there is a lot of products that include a Linux kernel and runs proprietary code on top.
I’m not really certain about the legalities, but IIRC it has to do with Linux being licensed under GPLv2 instead of GPLv3(?)
Imo the biggest problem with Teamspeak is that it still requires an active connection to the server at all time… So unless your computer is on with the app opened 24/7 you may miss messages. That may or may not be an issue, but you may miss messages that your friends send to the group when you aren’t actively online.
Frankly the UI of TeamSpeak is ageing as well, and there is value in for instance being able to simply attach a screenshot directly in a Discord chat without having to upload it to some external service.
I’ve been running straight Ubuntu with ZFS-on-Linux since 18.04, and it has been smooth sailing. If you’re running a lot of containerized things it’s very convenient to just be able to bind mount ZFS dataset into containers.
Normally I prefer CentOS/RockyLinux, or some other EL distribution, but in this case I really appreciate that Canonical isn’t purist enough to ship ZFS as a loadable kernel module that is guaranteed to be in sync with the shipped kernel. And don’t have to deal with DKMS.