When a service isn't being honest in their advertising, it makes you think about what else they're being dishonest about.
And yeah, then I'd agree, if Mullvad started lying or pushing useless services down my throat, I'd definitely dump it quickly.
I used NordVPN back quite a few years ago. Once they started advertising on cable tv shows, I knew it was time to jump ship. A VPN service spending that kind of money is either burning through cash too quickly to survive, selling user data, or a government honeypot.
Check out what vpn have been sued over the last year (they all have been no log companies) and you will quickly realize that logs are being shared by anyone of size. The smaller the service the better.
I do this as well! Annoy me with to much ads and I'll avoid you and your product out of spite.