Mozilla gained good will over the years and I like the browser. The vpn is fairly seamless and permissive for number of devices. I understand it is a wrapper on Mullvad and we are paying a healthy overhead. Still, it is worth it because I’d trust that if the vpn service provider behaves in bad faith that Mozilla will be able to quickly respond and adopt another provider. Whereas if it were up to me I may hear of it years later and not necessarily know what service to adopt instead.
My use is merely hoping to reduce tracking based on ip. I wouldn’t trust it to be subpoena proof. I’m not into pirating music anyway.