DT uses Impact in his videos, which has a heavy weight and is a condensed font. It really shows up well in thumbnails. A similar font would be [League Gothic](https://www.theleagueofmoveabletype.com/league-gothic). And [Google Fonts](https://fonts.google.com/specimen/League+Gothic?query=League+Gothic) has it.
DT uses Impact in his videos, which has a heavy weight and is a condensed font. It really shows up well in thumbnails.
A similar font would be League Gothic. And Google Fonts has it.