Twitter is becoming something strange. If on one side, Elon was supposed to bring Twitter back to freedom of speech, on the other hand he is making many changes to Twitter that are not really bearable from companies and projects.
I think that either people using POSH on Twitter will post them in specific sections where you can track them easily, or otherwise, you can ask for a weekly recap from each single user. In that way, you will have eventually less users but much more engaged and productive (also less work for PoshToken team to be done). In this case, you can also set that all the rewards for such posts are going to POSH Token, that will distribute the 90% of it to the best users and some random users (to reward also smaller accounts that may have lower chances to make big incomes with their posts).
I am not really familiar with Twitter API, but, can't you purchase different subscriptions with the same account? Or like "gifting" a subscription to the PoshToken Twitter account from another account?
Great points, @lordbutterfly also mentioned the idea to do a "one day of a week" POSH push so we'd remain under the $100/m tier limits but could still utilize the current automated comment sharing.
We'll figure something out, this is nothing but a scratch. :P