Your first paragraph tells me you don’t follow Olympic soccer very closely, as Men’s Olympic soccer IS a “youth” U-23 tournament, with 3 overage players.
99% of these u-23 players are pros, as a non-FIFA tournament, clubs they do not have to release them, and it’s often during European preseason. However for the MLS and some other leagues, it’s the full off season so no problems. It’s simply hit or miss depending on that players individual relationship with their club.
The women’s tournament is full team, so no age restrictions so in many ways it’s redundant to the womens world cup in that it’s pretty much the same. Also since women’s pro soccer is not as competitive as men’s, all the players are released.
Both men and women even at soccer powerhouse countries like Spain do “try and win”, its probably a third tier trophy in Europe, but is probably a second tier trophy in Asia, Concacaf, and Conmebol.
Like I said, in Europe the Olympic soccer tournament is a third tier cup, but not in the rest of the world.
Who cares about MLS, Liga MX, Brazilian Serie A, or Argentine Primera, J1? People in those countries do.