Mobikwik is a platform for investing.you will directly invest with transactree technology pvt Ltd(lendbox). So your money is with lendbox
Coming to your question it always risky to invest in any unregulated entity .they say it's regulated as NBFC under RBI ,but still if the borrower doesn't pay they will stop withdrawal untill they liquidate the collateral (if taken) from borrower you have wait till then. Still that doesn't guarantee you will get your money back.
As long as the borrower repays money will will be paid