Once he gets some useful information from Ye Hao, then... he has a reason...
The reason he wants is simple: to take the powerful empire as his own. The empire's vast financial resources and advanced technology can rival theirs. Such a force he has long coveted.
Moreover, he is very suspicious of Ye Hao's rise and the people around Ye Hao. Most shareholders of the empire are in their twenties, yet they can hold up such a commercial giant, even stirring up trouble in the UK, defeating Prince William. From this, we can see that Ye Hao is entirely capable of overturning the decline of a kingdom.
The decline of a kingdom! This is something not everyone dares to say. Even if Abama wants to intervene in the British royal family's battle, he must get the Prime Minister's permission; otherwise, he cannot get involved.
