it is trivial to strip suffixes off of aliased email addresses
How would you know to strip everything after my first name?
I would just strip everything after a + sign
This actually is not a bad point to make ... it would, in fact, be simple to strip +aliases but ... economically I don't think it makes any sense.
You'd have to have a high level decision maker dictating an engineering fix in order to increase email authenticity by ... .01% ?
... and that assumes that the "engineers" down the chain understand how '+' works in email to begin with and have somehow communicated that back up to management.
So who cares about what some engineer at a random new business thinks.
Aliasing isn't new. So this isn't a cat and mouse game that just got started.
A data broker primarily wants the social graph to make a user profile with a phone number, to show ads later on. Those people wont typically be texting or calling with spam and ads, theyll just match the number and contacts up with information shared in other apps so that ads in your normal internet browser or ad-include app use are more targeted
so if an erroneous contact never logs in thats of no consequence to them, so searching to exclude numbers would be less interesting and less likely than with just sanitizing emails