This is a good point.
However e.g. Tor only works because some non-natural persons such as associations, clubs, companies are the exit node and are willing to spend continuous lawyer costs out of pure goodness of their hearth to keep it running. VPNs solve this problem by having a financial incentive to do this.
VPN: good incentive but need trust; Tor: no incentives but trustless
You forgot about the NSA. They like to have exit nodes too, but I'm not sure it is out of the goodness of their heart...
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