YSK there are sites that offer you a temporary email address for signing up for services that require one (like some Lemmy servers)
They work by giving you a random email address that is available for a short time (ex. 10min) and an inbox for any messages you recieve during that time (ex. an email verification message from a Lemmy server)
I didn't want to recommend a specific one, however Googling "temporary email" should give you several options to choose from.
I prefer Apple Relay through my iPhone, it creates an alias that gets redirected to my inbox. if I see it gets spammed, I can in any moment delete that address. and bonus, they will never have my email account, so they can’t trace me, if there’s a leak the leakers won’t know my email, usernames etc.