https://www.whitehouse.gov/briefings-statements/statement-press-secretary-regarding-executive-grants-clemency-012021/
So that probably means that Ulbricht will stay behind bars for the rest of his life. Assange/Snowden still have some chance as there are enough mainstream politicians showing their sympathy towards them. Ulbricht's case is different and Trump was probably the only one who could have considered to pardon him. Feels bad, because he's in his 30s and unlike Assange or Snowden, people seems to have completely forgotten his case.
Assange and Snowden should both be pardoned. I think if you ask the public if they should be freed than most people would say yes. The general opinion of these two is that they did something good for all of us. They broke the law but not profit of it and rather do some good in the world.