If their master wished for a castle, they built one (with varying levels of efficiency: a powerful djinni may do it in seconds whereas a weaker jinn may spend years on the task). After all, the 'wish' was more like a command, and the jinn simply used their incredible powers to do their master's bidding.

If they were bound to their prison, jinn were slaves to their owners but did not have any reality warping powers per se. Some jinn got impatient and settled for just leaving if freed, while others took revenge on humanity by killing/tormenting whatever unlucky human released them. Jinn were not usually obligated to give wishes to whoever helped them if they did, it would be out of gratitude or an incentive to open the bottle. Some of the greatest magicians in Arabic lore were able to capture jinn to their service, and tied them to items such as lamps or rings. In Middle Eastern folklore, most popularized in the West in the Tales of One Thousand and One Nights, the jinn were a species of spiritual beings, somewhere in between angels and mankind, capable of great acts, both good and evil.

Genie aladdin somebody rub the lamp