It is important to keep in mind that newly created Strategies (i.e with a low 'Active days' indicator) with high profitability may often employ high-risk/high-reward trading techniques. While this may quickly bring these traders to the top of the leaderboards in the case of their success, such Strategies may not be suited for Followers looking for a more steady and stable ROI with low risk.
On the other hand, a consistent and steady growth of a Strategy's return on investment over a long period of time, can be a strong indicator of a Strategy with viable trading techniques and effective risk management. Definitely something to consider for those looking for a stable ROI.