> They go as far as asking to validate the email with a code
You can receive email in temporary email inboxes :)
> That plus the fact that they do send data to their servers for some reason...
But the temporary email inbox is some random `sdsfi39324@oduhuf.fru.xy` inbox you find on the internet (not some inbox you create by your own)... so zero data about you is sent (if any).
I have a real fake email address for this.
It's been compromised in a bunch of leaks, my real email address has never been. I also get way less spam in my real email.