Earlier quoted context omitted.
I whipped together https://getcovert.com to help address this problem for me. Currently it's a chrome plugin that allows me to generate a unique obfuscated "proxy" email address for sites I want to sign up for but don't want to expose my real email. If they ever sell it, redistribute it, or I want to shut them down, I just block that proxy email. It's barely an alpha project and needs a ton of work to be functional,…
I mean, I run my own mail server and client, so I can deal with the problem in a variety of ways... I've done novelty addresses in the past. My current approach is to call such companies out and hope that nobody ever gives them another email.
[1] Advertisers can then use that data to cross-track you between sites more effectively. [2] Marketers can re-target you without any sort of pixel tracking because facebook, google, twitter, etc., all can identify you by that email address you provided. [3] None of us have a loud enough voice to dramatically damage a company in a meaningful way b/c they were a bad actor.
In my mind, by obfuscating the email address, we take away its power. It loses a lot of its value when it's randomized per site, per user. It now is truly only useful for sending you an email, and if you get fed up with how they use that email address, they're shutoff forever (and have no way of tracking you).