Fours ways I’m aware of:
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Befriend or date them.
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Sponsor them.
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Piss them off.
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Convince an influential group of mutuals fans to make suggestions to them.
Plus,
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Win a contest hosted by the YouTubers.
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Participate in another promotional event hosted by them.
I’m kicking myself mentally for submitting to a jam connected by the hosted by a YouTube promoter during the latest call for boycotts. I was too focused on game development, for the challenge of it, and not paying any thought to the links or their meaning.
For someone who wants to be promoted on Google-controlled platforms, tho, jams and other challenges like it may be an option.