Comment by theaiquestion

from the websites themselves actually.

with a VPS as your vpn, reddit/google/facebook/whatever all see you from a single ip, one that might change even less then your ISP's, all of your alternative accounts will all share this ip as well, and 0 other people use that ip address. basically data collection and alternative account identification becomes dead simple because your ip is basically your universal id.

you stand out as an individual, part of the "security" with things like mullvad is that you share that ip

security in depth of course, fingerprinting and stuff still exist, but if you have such a clearly unique ip address you have 0 chance