I've been a Mullvad customer for some time and I'm quite satisfied. But the main issue I have is that many of its servers are blacklisted by Cloudflare and other services. Because Mullvad provides the strongest anonymity a VPN can provide, it attracts not only normal users, but also malicious users (scammers, hackers, or less malicious but more numerous scrappers).
I've run into this as well, but for what it's worth, this is a problem every VPN provider struggles with. The most colorful example I have is receiving an email from my bank telling me they've blocked access to online banking because someone tried to log into my account from a suspicious IP — yes, it was me. Luckily I use a fairly small local bank who cuts through issues like this swiftly with a short phone call.
