Fully Paid Lending Program

[Joe Jor]

Is anyone familiar with Fully Paid Lending Program that are offered by multiple brokerages?  What are the risks?  From my google research it seems that the only risks are
  *Contributing to fall of stock price as short sellers may borrow the stock to accelerate movement
  *Dividend risk: you would receive Payment In Lieu of Dividend which are taxed as ordinary income instead of the qualified dividend tax rate.

What am I missing?

As for the dividend risk, can this be negated if a ROTH 401k or ROTH IRA is used since they don't accrue capital gains?

Thanks for all your thoughts!
Joe