You can use it even if you only have a few. Seems like a nice visual tool to keep track of what you have. And makes a good reminder to cancel one of you haven’t used it in a while.

They didn’t even verify the email, so you can use any BS email you want.

There is a difference between “free & open source” and “free because you don’t pay with money”.

The first means it can be peer reviewed by anyone to make sure they aren’t doing anything shady.