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I have no idea... but maybe they wanted to give the college players some experience.

Lol
Not in competitions like this.
It will take another 8 years to reoccur

Just a small detail, but the summer Olympics are every 4 years, not 8. Well, to be exact, this time, the next one will be in 3 years since these current Olympics should have taken place last year.

Oh.
I lost count.
Thanks for the reminder

They do use them now with all players in team USA playing in the NBA. But before 1992 and the famous Dream Team, it was only amateurs players. I think a rule change in the late 80's was the reason they started playing with NBA players.
But now, basketball is much more worldwide, with plenty of foreign players in the NBA. The rest of the world is slowly catching up.

Okay
I understand
Just like Messi playing in Spanish laliga