Good news, they aren’t. Tons of content is on multiple services - if you really have a principled objection to Google, you should show that by supporting those services rather than boosting YouTube’s popularity.
"Tons of content on multiple services" =/= "Tons of alternative services"
There is only one viable alternative to Youtube that I'm aware of. I use it whenever I can, but that doesn't change the fact that Youtube holds a monopoly.