Researchers typically present findings in journals (or conferences in computer science). These YouTube videos aren’t research, they’re some mix of unscrupulous money grab and deliberate misinformation from Republican-affiliated groups trying to mitigate the political damage of the administrations abdication of responsibility for stopping the pandemic.

Generally speaking by attempting to publish the result in a journal or conference proceedings. There’s a process in place where your unreleased manuscript is sent to other researchers in your field for review. After making corrections based on their feedback, you can be approved for publication, at which point the general public gets a chance to evaluate it.

Having done it, I don’t necessarily love the process and would love for the process to be more open and accessible, but it generally works ok.

That's kind of irrelevant to people posting videos on YouTube though.

I totally agree. Maybe YouTube isn't the best place for a researcher to have their work peer reviewed.