It does not offer all the options from proton but I bought my own domain from OVH provider (France). Can configure email addresses in their admin user interface. I have one main account that I do not disclose. So when I need to create an account somewhere, I just go to OVH web interface and create a new alias for my main email.
The day OVH goes dark, I’ll just have to move my domain somewhere else.
I did not know about Addy.io. I’ll definitely have a look. Thank you!