There are marketing companies that can be fired to promote your YouTube videos. The popularity index of a given YouTube video depends on how many people are subscribing, commenting and liking the comments. The marketing companies have contractors (50-cent army) that are given the task of subscribing, commenting and liking the comments of a video of interest; this of course increases the popularity index of the video.I do exactly the same but new ones keep on popping.
These 3k like videos are getting too much recommendations lately. YouTube algorithm is fucked.