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Lemmy has a lot of really outspoken FOSS enthusiasts. It sort of goes hand in hand with the whole “anyone can spin up their own instance” idea that Lemmy is built upon. Same reason there are so many Linux users here. But that also means you need to take any sort of “just switch to the FOSS version it’s basically the same thing” posts with a grain of salt.
They have port forwarding, but they were bought by a company that has been caught stuffing malware into purchased programs. Basically, it was a company that has a history of buying out otherwise legitimate software brands, and then bulking them with adware as a quick cash grab on the existing customers.
That buyout was like 4 or 5 years ago, but it left a sour taste in many people’s mouths. Because everyone expected the PIA client to silently get bulked with adware one day. Since trust is basically the only reason to casually use a VPN, it pushed a lot of their users to alternatives.