I know a guy who uses a service that creates a unique email account for every service he signs up for. That way, he tells me, if he ever gets any spam, he can delete the account and it doesn't affect any of his other email accounts.
It does sound weird to the person writing it down and I've had more than one person say something like "well, if you're just going to give me a fake address, then don't bother" before I explained myself.
One other down side is that it is not as easy to reply to mail as the other, generated identity (in gsuite, you need to create a new account in the domain to write as that username and also maybe jump through a hoop or two). Replying casually can often reveal your main identity, which is often the one you are trying to strongly protect.
(I do similar on my domains and the Gmail alias is easier to do than logging into Admin CP and adding aliases there)
username+anything@mydomain.com is also a useful feature (as well as u.s.er.nam.e@mydomain.com – dots are all ignored in GMail; some services don't allow "+" in email address field, so you can use finite number of variants with ".").
These little tricks make GMail convenient for geeks :)
First because it leaks the underlying email (you can safely assume all spammers are well aware of this feature).
Second because if you start receiving spam, you can't stop it. All you can do is to try to deal with the firehose.
A much better solution is randomly generated aliases that you can delete.
Dick move, I know. Tell marketing that though.
I personally use gmail through a vanity domain and have a catch all rule, so I end up signing up with a fake email account for every domain (hn@mydomain.com) and then the catch all forwards it to my real account (me@mydomain.com).
At which point you should wind up in the "how widely can I advertise that you're a spammer and all your outbound email should all be routed straight to /dev/null for sending mail to an email address you were never given" filter.
Which works, until the Gmail users who bother using + addresses with filters start giving all legitimate senders + addresses and sending everything thst doesn't have one and doesn't come from Google straight to deletion (possibly with a stop by “mark as spam” en route.)
Adding a . in between any of the characters (or removing, if you registered the account to have .'s included) will still go to the same email address.
But you can't add .anystring to your address and still receive the message as you can with +anystring.
This always blows the mind of the average gmail user who thinks they registered first.last@gmail.com when they find out that firstlast@gmail.com also works.
And you're confident of this how? I'm not actually convinced this is true. It's definitely a widespread belief though.