Those guys are everywhere on telegram group chats. If you need some youtuber to promote your project you should contact them yourself through their official accounts. Fake accounts and bot accounts often ruin the funds of naive project owners. I remember one project's telegram chat where a certain account claiming to be a youtube personality came in and asked for the admin to PM them. But the real youtuber of that name had already done a video on the project long back - showing how illiterate and idiotic these scammers are.