I think because what you are asking for doesn't exist. If it did it would be a dB full of failed strategies.
I think that is probably the most useful reply here, the idea of some database of some strategies just waiting for you to pick up and make money with is pretty dubious.
While the first reply to the thread perhaps had good intentions it seems a bit optimistic: "I recommend grab the first one you find that sounds rational and demo it until you know why it works but more importantly why it doesn't suit you."
this assumption that some strategy picked at random from some easily available off the shelf list of strategies "works" doesn't seem particularly grounded in reality.
People invest serious time and effort into developing trading strategies and firms employing quants/researchers take a lot of precautions to protect the intellectual property they have. They also continually adjust strategies as markets evolve - as soon as you start to exploit an edge you start to erode it. I'm not sure why you'd expect to find any serious,strategies given away fro free - you might as well just take the money directly out of the wallet of the person providing it to you.
What you might find is a load of subjective stuff that can't be falsified and is pretty much near useless to you, that sort of thing can be shared and has little value and of course anyone sharing it can claim it is all down to the trader etc.. essentially more of a vague framework for someone trading on a discretionary basis.