Why does YouTube not like channels?

The photo below shows the schedule of subscribers and views of one channel created in 2018. It doesn’t matter how the channel started with or without advertising. From the number of views, it is clear that he clearly did not buy all of them (well, most likely). The channel is actively recommended and currently has 30,000+ subscribers. The graph shows that the channel has dropped from the growth of subscriber views to almost 0. Less than 1000 views in 24 hours. About 1500-1600 in 48 hours. The channel is on monetization and it seems to be the other way around because of this everything should be fine and the schedule should go up.

Reasons that can affect the drop in views on YouTube in 2021

All points below are collected exclusively from personal observations and considerations.

A lot of non-unique content. When a lot of third-party video is inserted, even if it is legal.

Virtually all video titles are written in Caps Lock (all caps).

Profanity.

Errors in self-evaluation of videos for monetization. When the author did not specify something and missed it.

A lot of comments with obscene language, and the second possible content, which is also considered the author’s content. The author is responsible for the comments and communication of users under his video. Not everyone understands this.

The train just left) Now wait for the next one)

Here is another channel with similar analytics. The second one has already been abandoned most likely.