I bought a domain from cheaper domains, connected it to paid ProtonMail and turned on Catch-All emails with the SimpleLogin Proton plugin thingy. I love it even more than I thought I would, I just make up a new email for everyone (I don’t need to create the address in advance) , and can turn them off individually, and will know who’s leaked my info because the address will be jbhifiwankers@mydomain.org or whatever.