No no, it's not about nationality.

The problem is that Inter spent a great deal of time, financial planning and strategy work to devise a way to buy Lukaku and ensure him a top tier salary.

Keeping also in mind that his last season was lackluster to say the least and that the main reason they were doing this extra mile for him was that he always displayed a strong desire to be part of the team.

And then when finally they found a way to make it work, he was not picking up the phone anymore and showing by also waiting for Juventus'answer that all he said was just pretty much lies. The management got really angry, I've never seen such reaction before, I suspect that they really felt insulted far beyond the standard business/trading play between parts.

Aside from what @dska22@lemmy.world said, these are different times. Serie A is much more brutal now with more competition and the continued dominance of PL as the super money league. Every club wants the best for themselves unlike how it was during late 80s/90s or early 00s where an overflowing amount of talent was in Serie A.

May be the others are Italian?

because they won or almost won a world cup for italy? also i dont think they dance around and literally reject their old club unlike Lukaku. Most of the case are that they are being sold to rivals instead of forcing a move or reject their old club to join the other