I don't think they're losing the battle. Many of the spam emails that Gmail misses don't require a fancy AI to detect. What I've noticed is that even simple heu

I don't think they're losing the battle. Many of the spam emails that Gmail misses don't require a fancy AI to detect. What I've noticed is that even simple heuristics could automatically catch them. As best I can tell, Google are simply insistent on trying to use fancy AI to catch what a simple heuristic won't miss.