He doesn't care anymore, but he kept his promise.

There was the free Ross movement, they promised to vote for him if he pardons Ross and he did.

He apparently tweeted about how much Ross's mum supported him during the campaign.

But my source for all this info is reddit

If he wants to make the most of his next/last four years as president, then he needs to keep his supporters happy enough to vote in Republican congressmen in two years. Many of his supporters are the type to not vote at all because they think politicians are all two-faced liars, so it's important to keep them sufficiently moralized to vote in 2026.

he promised to free Ross at the libertarian national convention. promises made, promises kept. https://x.com/CroissantEth/status/1856551964156342303

He rarely keeps his promises, so he must still want something from libertarians.

Well what do they have? Lots of guns and determination.

Maybe they make good allies, after the presidency somebody needs to protect him if he commits too many crimes.