If you spent $10,000 on prizes for people who did useful things in the community building / EA messaging space, and that happened to be attached to a post, it seems extremely obvious that this is okay. See, for example, EA Funds sharing information about how to apply for grants.
Yeah I think your behaviour here is fine. But imagine I spent $10,000 advertising a post I wrote. Would that be okay? The question interested me.
If you spent $10,000 on prizes for people who did useful things in the community building / EA messaging space, and that happened to be attached to a post, it seems extremely obvious that this is okay. See, for example, EA Funds sharing information about how to apply for grants.