I do use additional addresses the reasons are: 1) if company X becomes "spammy" (as in starts sending me too many advertisements, even though they are technica

I do use additional addresses the reasons are: 1) if company X becomes "spammy" (as in starts sending me too many advertisements, even though they are technically not "spam"), and their "unsubscribe" link does not work, I can stop the spam by removing their email address. 2) if the address for company X suddenly starts getting wild amounts of spam, unrelated to company X, I know that it is likely company X has suffered a breach and their email list is "out there". And again I can remove the alias to stop the flood. Almost all of them all drop into the same single inbox, so I don't have to also check N inboxes for N aliases.