Actually, Samsung's 2006 Blackjack was seen as a copy of the 2005 Motorola Q. Both devices ran Windows Mobile 5 Smartphone version (non-touch).
This is because Android was targeted at Windows Mobile, which had both touch and non-touch versions. (It was not trying to compete with Blackberry. At the time, that was seen as impossible.)
Google was worried about Microsoft and Bing search, not RIM which was mostly business oriented back then.
Well, but none of the phones you mentioned was black and had a similar name to the Blackberry, while the one from Samsung did!
Or Samsung's take on the Motorola Razr, which was called.... (can you guess it?)...
Blade
And that Android was meant as a competitor to Windows Mobile is obvious, they were afraid of WM dominating mobile and Bing dominating mobile search.
But then a wild iPhone appeared, killed Windows Mobile and suddenly Windows Mobile was no longer a threat.
Too bad for Google that they didn't stop Android then and instead tried to change it to become an iPhone OS competitor/clone.
That angered Steve Jobs and instead of being best friends with Apple and being the sole/most important provider of web services on iOS they got kicked out with the release of iOS 6.