For the BT headsets audio quality, you should be able to change the audio mode as it might be selecting Headset (HSP/HFP) by default which is used when you need to use the microphone. Instead select High Fidelity A2DP mode which will stop the microphone working but give you the proper audio quality.

So what they’re saying is they could get all that extra revenue if they lower their price and just undercut the competition?

In the article for NordVPN it states that Port Forwarding doesn’t work when using NordVPN.

I think you’ll be pretty disappointed with anything else that’s available. Of those two I’d say stick with OnlyOffice.