[_8j50]

Not just your ISP but the ISPs ISP, local police, government, etc... one thing people seem to forget in such situations is your ISP router's security, is it better or worse than Mullvad's security? A compromised router can and has (see VPNFilter) rerourted traffic through attacker compromised infra for mitm and most people have to accept whatever crappy gateway is given to them. If you are on arbitrary wifi networks, the chances of joining a compromised network get higher with the more networks you join but having one constant potential point of failure that you can reasonably take measures to account for is better.