I don't mind those types of comments, if they're not too blatant. I mean, if someone wants to come over to your video and comment in order to bring people to their channel in a "subtle" way (ha!) then go for it. They're innocuous and I usually say, "Thank you!"
There are a couple of people who leave the exact same comment on every video I post, and it's hilarious to me that they go into the spam folder every single time, but that seems to be their technique.