I despise the fact that they keep people from migrating away. They're not giving any option of forwarding the emails for free, which means you can't make a smooth transition out.
Protonmail doesn’t stop you from migrating, they’re stopping you from *indefinitely using their domain and servers, for free*. GMail has an incentive-they’ll scan your emails for information about you and use it to target you on their other platforms. Proton has no such incentive, and no obligation as far as I can see.
It should be no problems for the new owners to let me in and use it whenever I want. I know I dont own it anymore, but really it would just be unreasonable to not let me use it.