Well then, in that case you should read your email more often than once a week. At least I seem to get info about the GoG promos into my mailbox. Does someone have a different experience, not all of them coming or something?
The GOG mailer works very erratically. I myself usually get the mails, but not always; some users have reported not receiving the e-mails at all, or a few days too late. It's been discussed before.
But yeah, bitching about missed promos is nonsensical. It's not GOG's duty to make sure every single user knows about every single promo they run. This modern culture of entitlement is a sad, sad thing.