General Investing powered by BlackRock®

What’s the difference between General Investing powered by StashAway and General Investing powered by BlackRock®?

Does BlackRock make money out of the General Investing portfolios powered by BlackRock®?

How should I choose between General Investing powered by BlackRock® and General Investing powered by StashAway?

What is the relationship between BlackRock® and StashAway?

I can access these ETFs on my broker. Why wouldn’t I just buy them there?