Where is the money coming from?
HUD grants and other Federal and State housing programs.
Like all ETF's, Blackrock as the "sponsor/manager" will get a fee, but the ownership (and profits derived from such ownership) is(are) divided up among the owners of the ETF.
Whether this ETF will be structured with a cash payout or an accumulation and reinvestment of capital hasn't (to my knowledge) been released yet.