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For me working in business there is always one line that sticks in my head.

Attitude reflects leadership.

The newer accounts joining will look at the biggest accounts and the ones earning the most money and try to copy what they do. If those people are earning by acting in the right manner, people will copy that.

If those accounts are plagiarizing, scamming and just being shit posters then people will follow that example as well.

It's about setting the right example within each community from the top down and the people joining those communities will follow that culture. Whether it a good or a toxic one is up to the community mods and and larger accounts as they are the ones that incentivize how people act.