Protonmail.uservoice.com is supposedly “The Voice of the Proton Community”. Well last week I was tracking a post that was rising rapidly to the top-most voted in the “general ideas” category. And this morning when I went to check if it was at the top yet, it’s just gone without a trace. No sign that it was ever there.
Create a catchall address for your domain, and update the MX records on your domain to point to your new email provider. It doesn’t matter that you were using simple login previously. Fastmail offers this for example.