This is still just an allegation until these posts have been presented in court and he has been convicted. You really don't want to set a precedent ignoring presumption of innocent.
Firefox on Android allows extensions*. So Firefox + Ublock Origin + YouTube mobile site.
*Limited to a selection of pre-approved extensions (Ublock Origin is included in said list); however, you can get around this by using Firefox Nightly and enabling developer settings, which allows you to add a custom list of extensions, which can include any extension for desktop Firefox, including things like SponsorBlock.
By that logic, all human art is derivative work achieved via biological means. No artist works in a vacuum. Everything an artist sees subtly influences their style.