This suggestion (and the comparison to phone companies) comes up repeatedly but Youtube can't _be_ a neutral carrier if they are funded by advertising. That's because the businesses' choice to pay for advertising is not a neutral choice. See "advertiser friendly content"[1] and Adpocalypse[2][3].
Land line phones and cell phones are funded by subscriptions and they are also point-to-point communication between 2 private individuals. Phones (barring small-scale exceptions such as conference calls) are not a "broadcasting" medium.
There is no broadcasting medium in the world that acts as a neutral carrier. Not newspapers. And not tv like NBC/CBS/ABC. Even the government funded broadcasters like American PBS or UK BBC are not neutral carriers.
Ok, let's say you this ambitious idealism to create a new broadcasting website that allows anything except for child pornography. How are you going to fund it? Advertising?!? That's just recreating the Youtube "ad friendly" dilemma. Subscriptions? Most people don't want to pay a subscription fee for user-generated-content. Yes some die-hard web surfers pay for Youtube Red/Premium to avoid ads but they are a small minority that's not enough to pay for the entire Youtube infrastructure. So far, only funding based on advertising seems to be viable.
[1] https://en.wikipedia.org/wiki/Censorship_by_Google#Advertise...
[2] https://www.google.com/search?q=biggest+advertisers+abandon+...
[3] https://www.tubefilter.com/2018/04/20/pg-resumes-youtube-spe...