This is the ridiculous bit. The rich clubs have spent years stockpiling talent, spending as much money as they possibly can to get europes top talent nto their doors. Taking huge risks with players and ruining their future prospects by shutting them out. While the club deem these players not currently good enough to be part of their team, they loand them out for them to gain experience. All the while this players value is rising, meaning thet the rich club can sell at a profit to the club that has become dependent and use this as income, allowing them to spend more on established players under the FFP rules set out by the friends of the rich clubs.
To be fair I haven't heard any of the "rich clubs" squealing about this......nor indeed UEFA.
As you say, they benefit by the players gaining experience and maybe adding to their value in the process.
It is tabloid journalists, always on the lookout to provoke one more controversy, who are trying to stir things up.