Because these strategies are easy to set and present low risks, there's a very high demand for them. However, you certainly noticed that in the leverage process, borrowed MAI is swapped for DAI (or other tokens). If too much MAI is sold on Beethoven, its price will decrease slowly and there is a risk for MAI to lose its peg, which is pretty bad for a stable coin. In order to let time for the price to stabilize, Mai Finance has security mechanisms in place, and the most important one is a debt ceiling for each vault.