The advertising is the worst thing about Proton. I've made them aware of this several times but it just keeps getting worse. They started putting ads in the VPN app now.
As far as I'm concerned, as a paying customer I shouldn't be subjected to ads but, what're ya gonna do?
It's not a single ad. It's a new ad every time they launch a new subscription service, or have some sort of sale, several times a year, across all of their products, with no way to permanently disable them.