[Sohcahtoa82]

I used to use a catch-all with a custom e-mail for every website I used. I had amazon@mydomain, newegg@mydomain, etc.

I found that despite what people think, your e-mail address isn't being sold. At least, not by any vendors with a remotely decent reputation. I never got spam to any of those e-mail addresses.

[kiwijamo]

That is my experience as well. I have heaps of 'Masked Email' aliases for my Fastmail email account and the only significant offender I've come across is various Kickstarter projects (as I understand Kickstarter passes on my email address when a project is successfully funded) and various Bitcoin sites from back when I dabbled in Bitcoins. All other reputable companies have actually not sold any of my email addresses (including some I've noticed elsewhere in this thread accused of doing so, which I find quite interesting). I am now at the point where I'm considering migrating back the majority of my aliases back to [e-mail] address for most things. It is more hassle than it's worth as I often forget I had a Masked Email and end up creating a second account. Also in-store if I need to provide my address it is awkward giving out what sounds to store staff like a dodgy address. Also when I reinstall my computer/phone/etc it's a hassle figuring out what login address I used for each site/app I have accounts with. I may use Masked Email only if there is a higher level of risk.

[ProllyInfamous]

I ran a catch-all for two decades, including during my IBEW apprenticeship. They were unabashed on sending their own (and others') SPAM daily – direct-to-trash.