I think most Youtube spam comments are done by bots, I can't imagine people are stupid enough to waste their time manually doing this. I know some people do but they are stupid as they are just wasting their own time.
The majority of them are caught by Youtubes spam filter but some do skip through.
What's a bigger headache is sometimes good comments get caught by the spam filter so I like to manually go through and allow some or allow links as oftentimes I ask my subscribers to drop a link but whats frustrating is having to sort through literally thousands of spam comments to find the legit ones, I can't even keep up with it.
What's even more frustrating with this is people who steal my videos and reupload them, happens about a dozen times a week.
I just subbed to your channel, not to be a spammer but check my stuff out I think you may like it, I'm into affiliate marketing, merch, ecommerce, kindle publishing, really just hustling
I think it is a combination of techniques unfortunately. I've seen a couple of software packages that auto post or auto comment to followers(Lazy subs and content creators I guess). I've also seen real people trolling as well who have attempted to recruit me after I left a comment to the channel owner!!! Agree with MrWalt that it is extremely annoying.
@rulesforrebels I'm actually subbed to your channel and I have seen a few f your videos. However, I agree that some comments are bot driven, but a good number of them are done manually as well. I have had a few people take my video content but not many due to the type of content that it is. Also my channel is nowhere near the size of your channel. But I appreciate you taking the time to stop by and comment as it is very much appreciated and I will definitely stop by your Steemit blog and YT channel more often.