M-Zone has a package of "sending messages repeatedly". What is this for?

Repeated SMS sending is a mobile way to encourage users to forward SMS. Mobile will send you a seed message every day, which may be humorous, healthy and life-oriented content. You can forward it to other numbers when you receive it. Then Mobile will rank the forwarded users. The more forwards, the higher the ranking. Each ranking will give a different phone bill, and there will be an irregular lottery. Personally, it doesn't mean anything. It's just that mobile phones cheat SMS fees. How do you know how much to send to rank? It feels like a bottomless pit.