Mullvad:
https://podcast.simplifiedprivacy.com/mullvad/index.html
https://simplifiedprivacy.com/how-this-vpn-works/epic-pitch.html
Proton:
https://podcast.simplifiedprivacy.com/proton/index.html
Both:
Video: Everything You Know About VPNs is a Lie
https://simplifiedprivacy.com/everything-you-know-about-vpns-is-a-lie/fast-easy-video.html