Not sure, but when they have various political candidates getting millions from the crypto PACs and all of them in unison talking about how Ross Ulbricht needs a pardon, I'm not sure what else to tell you. Maybe someone just knew Ulbricht personally and is using their money to spring him.

But unless you can point to any other group with actual power and money who was pushing for it, the most obvious answer is that the main funders of the crypto PACs were at least ok with it. There's no way they couldn't have subtly squashed this pardon with Trump if it was just the Libertarians asking for it given that they seem to have gotten him to commit to do literally everything else they want.