I also use Mullvad VPN exclusively for my VPN needs. The fact I can get 6 months of access with a scratch card bought from a store & my account is just a random integer number is an example of privacy by design: no email, no phone numbers, no credit cards. I don't even do anything illegal, I'd just rather have a (what I feel) trusted option when I want to browse the Internet anonymously.

The best thing is that they accept crypto. I wouldn't want to pay for a VPN with a credit card in my name.

Not sure why you've been downvoted. Somebody protecting their business?