This is positive cashflow only cause of the interest on cash....

This is positive cashflow only cause of the interest on cash. But investors aren't dumb as we can see from drop in cash balance. I moved away from SelfWealth to IBKR for this reason cos they were paying interest on my cash. Others can probably transfer back to their own bank accounts for even higher interest. I even emailed to see if they will bring interest back on cash as they previously did ages ago precovid but said no plans.

This is the main risk here - people moving their cash away.