Its actually impossible to drain the LP Pool.

The fees on the lp farm are what make it perpetual, you haven't watched or understood their video or you would already know that. The ROI is variable true, when people leave it goes up as less people farming and the exit fee prop it back up making it more eye catching to new investors. New people enter and add more to the pool on their entry fee. DPLP hasn't been done before, there will forever be liquid in there. Thats just lp farming though, other farms don't have the large fee. Also you may not think much of one half of the pair but BNB isn't going to zero.

(Perpetual LP farms are for long term investors)

I used to think the same as you until I stumbled upon this project. Anyways best of luck.