They won't have to lift a finger. It'll destroy itself. The very concept of a "free speech platform" is self defeating. Because the fact of the matter is, you have to censor some shit, or else the platform will turn into a shithole. This is the reality people don't understand until they've tried moderating. A political discussion forum is like a nuclear reactor. If you take a hands off approach, the place will just melt down. The default state of an unmoderated space is basically /pol/. Nothing but the worst kinds of content and commentary. A radioactive, toxic cesspit is what you'll have on your hands if you don't apply editorial curation.

So one of two things will happen with Trump's platform:

1. They'll censor the white nationalists, then the media will say "See? Trump just vindicated online censorship against hate speech!", a large segment of the target audience will object in principle and become disillusioned, and the forum will be embroiled in a civil war between the white nationalists + anti-censorship bloc vs the management who are censoring them (just like Omegacanada is).

2. They'll leave the white nationalists alone, those white nationalists will take over the platform because the sane people who don't want to be part of a white nationalist community will all leave, making Trump's site a homogenous white nationalist echo-chamber. The Media will use that image to "prove" that MAGA people are all racist, Trump's brand will finally turn into what the left and the media imagine it was all along and that'll be Trump's legacy: A couple terabytes of n-bombs and jewish conspiracy theories with Trump's name on the masthead.