It’s not. I give a unique email address to every service I register with, which means I can see who is leaking my email address. Very few of them leak my email address at all, and those that do tend to do so involuntarily through data breaches.
The other main factors in spam are the sleazeballs at Apollo, ZoomInfo, et al., services that use my email address internally for more than I consented (if I use my email address to register for a service, this does not permit that service to add me to their product mailing list), and the spammers who guess email addresses based on LinkedIn info (e.g. name + company domain).
The number of services who appear to take an email address I have given them and sell it appear to be extremely rare.
There’s no real management involved. I set up a wildcard MX record for *.example.com and hand out jim@<some-id>.example.com whenever anything needs my email address. I don’t need to specifically set up an alias. If spam comes in, I look at the To address to determine where they obtained my email address. Fastmail can be configured this way, for instance.
Most mail providers also support plus addresses or wildcard local parts, so you can do jim+<some-id>@example.com or just <some-id>@example.com. Gmail supports plus addresses, for instance. The downside is that some services reject pluses and some spammers strip out the IDs.
>but plenty will just sell everything to data brokers.
Again, "sell" implies that there's some company where they'll accept data from anyone and pay them for it, which so far as I can tell doesn't exist. That's not to say there's no selling going on. The fact that data brokers exist means they do, but that doesn't mean every business is in a position to "sell" data.
It's worth nothing. This is an online myth that marks out the user the way the sentence "Expert in JAVA, AWS, GCP, Oracle, and GIT" on a resume marks out the candidate.
I used to invent TLAs on the spot for fun, and when someone asked what it was, would respond, "It's a PUA", eventually revealing that meant "previously unknown acronym". It was even more annoying that it sounds.
Homebox seems to be a good way to make that happen, FWIW. I looked at it for when I was moving house and it had way more than I needed. But it does support the QR code printouts.
If everything went perfectly everytime we wouldn't need any safety equipment, but things aren't always perfect.
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