The other commenter said a lot of what I would have said. I use Twitter daily, but I'm also a streamer, so I follow and chat with a lot of streamers, and anyone else who has common interests, on Twitter.
The main thing about advertising your Youtube channel on Twitter is that people don't want ads, so you gotta phrase it with some other interesting info, don't just drop your YT video link, but rather say something interesting about what's in the video to pique people's interest. Twitter favors native videos, so if you're willing to put in some extra work, you can get the most bang for your buck (figuratively speaking) if you edit a short snippit from your YT video that you can load directly up onto Twitter with your post that links out to the full vid. Some people do that, and upload native versions of the vid also on IGTV and/or Facebook page.
In general Twitter (to me) is good for the fun of socializing and conversing in Twitter threads on topics that are actually of interest.
For those who loathe social media, it will not be fun, and if it's a struggle to get interested then it's probably not worth it lol. I can totally understand the viewpoint that people don't have time or if they're not interested in dealing w/ more social media. But it can be fun and helpful if you're into it :-D Once you follow some genuinely interesting accounts and have a good feed then it's way better. I personally look for entertaining / educational accounts to follow (mostly game developers and streamers, and plenty are also YouTubers).
Hope that helps.
