Whenever you connect to a VPN, you use the same IP address the whole session. You have to reconnect to a different node whenever you want a new IP.
When you connect to a Proton or Mullvad server, you're sharing that IP with thousands of other people. We've already been over this. It's privacy through obscurity.
Your objections aren’t rooted in any sort of actual concern over privacy
Okay so it sounds like you don't understand how VPNs work and aren't willing to learn, and because of that you aren't capable of engaging in good faith, so I'll let you be on your way.