There is no "Mastodon", only a loose network of federating servers. So "Mastodon" cannot "bring in" more of this, that, or the other. Nor can "Mastodon" prevent people spinning up their own servers and trying to federate with others.
And lastly, "Mastodon" cannot make individual users look at anything they don't want to look at – there are no pushy algorithms here.
Seems to me that some people who ought to know this need instructing.
