Yes, question raising more investors when my (reduced to) £100 still isn't lent out after many months.
It could be driven by believe that this bonus scheme will bring a substantial amount of new borrowers and in that case the pool should be full of cash ready to accommodate the demand. I'm really not sure if persuading your mate to take a loan for a reward of £10 and 5% interest cash back incentive for prospective borrower is a reliable strategy.
I didn't get from T&C whether your investment (or at least part of it) has to be lent to qualify for the bonus. Say if I introduce a friend and they invest 1k, will we get our bonuses if this 1k never managed to get out of the "pool"?