I use Proton aliases regularly. Websites get hacked regularly. I do not use my real email address on any websites. Proton allows creating unlimited aliases on the fly, and that's one if its strongest attractions. The aliases forward to my primary email address, but when a website gets hacked and the address starts getting phishing and spam, I can just disable it. It's not if a site gets hacked, it's when. If those aliases get banned at a site, I will no longer visit that site. So far my alias for this site has worked.