I do that too… but sometimes its hard to tell which email I should use.
For example, if I create a patreon account to pay people - I’m giving financial info and accessing stuff that I actually care about - which suggests I use my ‘real’ email address. But on the other hand, the email address is shown to people I’m paying, and I don’t necessarily want them contacting me in that way, or even know that that email address exists. As in, I might want to support them - but that doesn’t mean I trust them to respect my privacy. So then maybe the spam email address is the way?