I got so tired of sandbaggers that I mainly only race where they aren't an issue. Zwift Racing League has its share of cruisers, but you can't really sandbag, and mass start open races where everyone races together and you're just hunting for the fastest wheel to chase regardless of cat (I know I'll never win those, so it's about finding people that I "shouldn't" be riding with based on ZP numbers and hanging with them as long as I can).