the 2nd one is a scam that google never tried to remove

It's a little more complicated. uBlock was the original name, gorhil handed it off when he felt the maintenance burden became too high. Then he forked it to make his own uBlock Origin version.

At some point later uBlock was bought up by the AdBlock people, who in turn were later bought by the AdBlock Plus people.

So it's not a scam exactly, more like an inbred sideline of the royal family.