They can choose to undertake the gargantuan task of making another site to compete with Youtube
In order to do that, they need to
Step 1.) get a lot of money from somewhere, probably donations, make the site, get advertisers to agree to make a system similar to Youtube so content creators and the site can make money.
then
Step 2.) convince the thousands of people whose entire livelihood depends on the money from their videos to, at once, move to the new site and then pray to god that nearly 100% of their viewers move with them so they can continue without losing money to pay their bills.
Step 1 is a colossal task, Step 2 is impossible. Youtube has content creators by the balls and they know it, which is why they are doing all this shit because they know everyone is stuck on this site.