Have you found a replacement? I did some light investigation but nothing really felt as solid as Mullvad so I haven't jumped ship yet.
For what's worth, I eventually went with Proton VPN, but it's more expensive and gives a used-car-salesman feeling.
I really don't like the aesthetic direction Proton's been taking in the last few years, from top to bottom. I'm finding their mail apps, both in desktop web browser and on mobile, less and less usable. In addition I get this feeling from their design choices as well. I know their mission is to grow enough to challenge predatory providers like gmail, but it makes me wary and makes me feel as if I won't be using them in 5 more years.