This is a better content and it's rare to see telegram channels that are doing this kind of service to their channel members. Most of the telegram channels lately are more for obvious promotions and marketing but don't contribute something important like this.

Might be part of the marketing, they'll get a lot of members and then they'll offer companies to work with them and advertise their products, services through that channel. While the advertiser isn't aware that most of the members came from a service of joining and get paid.