How did the Bosman ruling destroy the chances of smaller clubs in the Champions League?

Before/after Bosman ruling

Avant :
– Limit of three foreign players per team on the field
– Compensation requested for any player at the end of their contract
– National football with little player mobility
After :
– No more limit on foreign players per team
– No more compensation requested for a player at the end of his contract
– International football where the free movement of European players has become the rule