Yeah I had to move to another provider over this. It's sad, I like their policies and services, but it's a deal breaker.

Getting in trouble? It's more like:

• Server providers threatening to terminate business with Mullvad because some of its users used port forwarding to host contents that meant legal trouble.
• Mullvad chose to terminate support for port forwarding in a transparent way and gave clear dates to prepare. This was done instead of selling off their users or collaborating with whatever legal threats they were facing.

I don't like it, but at least I understand their business decision. Even if I took my business elsewhere, they have a solid point on transparency.

I never really used a VPN, what is your usual use case and what exactly would I need port forwarding for?

Same, I really liked Mullvad and wasn't even with them long. But it is what it is.

What other ways are you referring to, if I may ask?

If you read the report there's both context there and also on their site mullvad have commented on the found issues stating either reasons or what they are doing to fix it.