For now I have just added it to the report around friendly/solo games counting, which according to the FAQ shouldn't be happening. https://boardgamearena.com/bug?id=214627
I could create multiple reports, but at the same time if they see that report they should see some of the apparent wider issues as well.
The thing is you have to think this is quite widespread, it's just very hard to get a full picture, because I imagine very few people are gurus for multiple games, particularly popular games.