Custom domain catch-all use

So i've set up a custom domain to use with protonmail and was curious if anyone else uses the catch all in this manner.

I was thinking that when a new account is created on $website I would use a custom email address that would then be caught by the 'catch-all'. So say the domain is catata.fish, and the website is target.com, then when signing up I would use target@catata.fish. Previously when using gmail I would use email+target@gmail.com.

Does anyone see any issues doing it this way? Thanks!