theoretically true to some degree. Your first 100 subscribers you're building a reputation. You're building a trust. up to 100 subscribers, these people are subscribing in the hopes you'll have more to give, they're hoping you'll be regular (I still need to work on the regularity) and they HOPE the videos you upload will be similar in value to the videos they may have already watched. When you're in the thousands, you're already establishing these elements and you have a more dedicated viewership. when you have 10, very few are watching, you're probably not getting many comments, and it just FEELS longer. It does gain momentum after a while.
How do you get there. Put out constant videos of VALUE that give someone a reason to subscribe. Why should they care about you? if someone doesn't know about you, you have to give them a reason to care, you have to show how good you are so that you can develope that relationship and community.
It took me about 3 months I think to get my first 100. and because I was following the trend of Jurassic World, the next 1000 came roughly a month or so later.