First search for a commodity item returned pages full of conspiracy theories and then drifted in to anti-vax territory.
Universal broadcast does not work (beneficially for society) in an industry built to monetize reach.
Everyone is entitled to their opinions, but voices are not equal in utility or worth.
"2) who decides which voices do matter?"
This is always the problem, isn't it? I don't have an answer for you.
We could get away from it only if we figure out an answer to the second question but I suspect we'll never get to an answer.
Only in that reach will continue to be monetized regardless of its impact on society.