How reliable is it to self host SimpleLogin, AnonAddy (addy), etc?

I have a private @gmail and a business @company.com (also via gmail), which I heavily rely on. Due to a recent data-leak somewhere, I'm now receiving unstoppable spam on my @gmail, and decided to set up a new account on proton and ditch @gmsil in favor of @example.com. I came across SimpleLogin, and thought that I could use that...