I don't think Tom would ever do that. From firsthand accounts from people I know who know Tom, that would be extremely out of character and not consistent with their moral compass.
I meant to reply days ago, but, if I were to hazard a guess:
• Tom Scott's brand is Tom Scott the Creative Vision, and Tom Scott the "It's Ready When It's Ready". Sacrificing either would drive away the audience.
• Having a presence on a creative collective platform like Nebula affords a great deal more autonomy here. Yeah, while the YouTube channel occupies a special and inimitable place, there's not a lot of recourse from their mercurial and non-transparent algorithmic changes.