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Try adding more good friction to your user acquisition funnel. If someone really wants to try your game, have them sign up with a valid email.

It seems counter-intuitive 'Why would I add more work for people who want to use my product?' - but the truth is you're just creating more work and wasting resources qualifying poor leads (in your case bots).

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Agreed. It's should be about the quality of leads not the quantity. I've seen it happen with Facebook Lead Ads where those are almost worthless because of the ease to sign up.

There's always invisible recaptcha, which does nothing unless it has a high suspicion of being a bit.

Invisible recaptcha silently and randomly breaks your page for prudent users who run umatrix to cut down on tracking/spyware/malware garbage.

But I would think they would not have seen the ad in the first place?

Yeah, it's something that would only need to be put on the landing page for the ad, not elsewhere (until you're worried about bots creating accounts on your platform for other reasons)

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