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BA and Star Rail are the main ones I see a bunch of ads for. 
There was a big ad campaign for WuWa when it first came out but haven't seen much since. ZZZ had one ad that would play on the TVs in trains when it came out and thats it.
Genshin had an event in Ikebukuro so there were a bunch of ads there but other than that haven't seen much for it either.