Spammers, trolls, and ban evaders often use temporary email addresses. PieFed now checks a list of known temporary email providers and displays a warning icon next to registrations that use such services.
If registration mode is set to “Open” (no approval needed) then the site admin(s) receive a notification instead.
A throwaway email address isn’t always a bad thing but it’s one factor that admins might want to take into account.
Does this include people that use email aliases to keep the connections between accounts harder to make? I pay for this service so it’s genuinely not a throw away account. Just a way to maintain some privacy.
I don’t know which service you use or whether it is on the list. But if it’s a paid service then it’s probably not on the list. Things on the list are like https://10minutemail.com/ or https://www.guerrillamail.com/
You’re free to maintain your privacy and admins are free to weigh the potential risk of accepting an application with a warning icon on it. I’m sure there will be plenty who ignore it.