I think that large tech companies giving a snapshot of what cool or interesting things they do is great but if there are bigger problems that don’t seem to have that kind of focus it just feels like a marketing / recruiting post (which isn’t that bad). But, the problem would be if they made public antispam systems they can’t give that to spammers which presents as a catch22. Also if you have humans in the loop to evade a spam system it is basically impossible .