http://o54hon2e2vj6c7m3aqqu6uyece65by3vgoxxhlqlsvkmacw6a7m7kiad.onion/en/blog/2018/10/17/signals-trustworthy-vpns
The user has to trust that any personal information is not misused, that their web browsing habits won’t be abused, and that their data is not unexpectedly handed to external parties. In short, VPN providers are in a great position of power over their users.