When YouTubers tell me in every single video to subscribe to their channel. Look, I love YouTube, I am on YouTube every single day, sometimes for up to an hour if not more. There are some channels I visit regularly, others sporadically, and a ton of other content from random YouTubers. I do not need an update sent to me every single time one of these channels posts a new video. If I like your channel, I will get to each and every one of your new videos, trust me.