He does seem to push a lot of Emotive,
He is getting a 1099 from Emotiva for 2022 so it's kind of his job to promote them. I think he sincerely likes their products as well, but obviously his channel pushes a few brands very hard. Same with Gishelli Labs.
He's getting on well with Schiit as well, I know Schiit is sending Darko a nice 1099 for last year. Those factory tour videos are paid for.