It is a turn-off when someone begs for subs literally their whole video. It literally destroys the whole purpose of their video. I understand asking for subs maybe once at the end, but I think it should be earned and people should sub without needing you to tell them to.
Some of those GTA V vidoes like "How to stop the train" that are around 10 min long. And then they guy/girl just starts talking about nonsense and perhaps around 6 min in he/her actually tries to stop it for around 20 sec and start talking again about nonsense.
Clickbait and people asking for sub for sub. 1. Clickbait is just annoying and I usually downvote it every time. I know they get plenty of views but most aren't that good of quality of views and are just spammy compared to what you're expecting. 2. Sub for sub gives you an artificial inflation of subs. Sure they look great but when you have 300 subs and 10 views on each video, you gotta realize that something is definitely wrong