AnilG was spot on with his example. There are few other crowdfunding platforms that allow you to practice different forms. An example of one could be using your credit card to purchase inventory on consignment for a brand. Obviously you would want to choose the card with the best rewards for what you want. Back to the example though, with this inventory your purchased, you would have a payback schedule so you could determine you payments prior to maximize your rewards.
Now the way this falls into MS is say you used a card that offers 5% cashback to purchase inventory with an earned profit of 10% over 1 month (completely unrealistic) and purchased $10,000 worth of inventory. With this example an time frame you're expecting to have $11,000 earned profit. That would allow you to pay off $10,000 worth of credit, get $500 from the cashback and still make $1,000 from the earned profit. Disclaimer: This is just an example, I know that there is no way a platform could offer this, which would also be like 120% annualized.
Now that's the basis for the platform I use. I was hoping with this thread to find other ways or maybe even some other cards that people use.