Currently, it is possible to select "Remove results from this site", which if applied to a Youtube result, would remove all Youtube results from searches.
As there are junk accounts like Roel van de Paar, it would be good if there was an additional option to remove results from specific accounts. In that particular case, Roel is a completely automated channel that provides nothing but absolute crap that hijacks searches for tech problems and presents itself as "the answer". They're worthless, add absolutely nothing, and are just passive income for the dude. I'd love to remove results from his channel from my searches, but I don't want to remove Youtube entirely.
Removing results from Youtube channels would allow users to clean up junk (such as Roel van de Paar) from their searches, improving search quality without removing an entire website (Youtube) from results.