When YouTube sees that your subscribers aren't watching, it assumes your content is bad or irrelevant. Consequently, it will stop recommending your videos to real people, killing your organic reach.
Here is what happened to channels that used "free 2021 youtube bot subscribers": free 2021 youtube bot subscribers
Don't spam. Add value. In 2021, the YouTube algorithm weighted first-page comments heavily. When YouTube sees that your subscribers aren't watching,