All of these managers on this list, including myself, will likely not work with you on the current model you proposed on telegram. A revenue share deal does not pay participants and does not guarantee they are paid for their work either.
You need funds to just flat out hire a manager to help with contests, giveaways, campaigns. You needs funds to pay participants. If you have this, then any of these managers will take the time to try to help you out, but the proposal you sent is not one that many will accept.
I do not know what the team proposed to the managers, but they need to realize that if they want to advertise here, they need to allocate certain funds for the marketing which includes the manager's fee and the participant's payments. No one will be willing to work on the condition that if we can bring you sales, the gambling team will pay us and if there is no sales, there may be no payment. Also, such a model is not transparent because the site can always show fake stats in order to avoid or lower the payments.
They need to think that so many trusted gambling sites are advertising through signature campaigns for long time, meaning that the ROI to advertisement on this forum is good one.