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I will admit it's unfortunate to have to pay per inbox on FastMail. I can't even pay less for my second box to be smaller and more limited, it must be at the same rate as my main box.

They do allow infinite aliases which covers most of my needs, but when I wanted to use a FastMail box for my home automation system's service account it didn't make sense to do so.

Zoho offers catch-all adresses on their service so one inbox can handl hundreds of adresses.

Not exactly the same as hundreds of individual addresses/inboxes, but may fit some people's needs.

I've been using Zoho like this now for a little while and I am pretty happy with it considering the price.

Zoho is per user/inbox but a single user/inbox can receive emails for multiple domains and email ids. You can also set up individual sending identities. I am currently receiving email for 7 domains while paying for one.

There is an undocumented limit though. You can generally only have upto 30 aliases.