So when you download and install third-party apps onto your jailbroken iPad, you may introduce malware, spyware, and viruses that can compromise your data
Although modifying your own device is perfectly legal, Apple has made it clear that jailbreaking is a violation of the iOS software license agreement.
Also, because third-party apps can access features and protocols not available for apps designed or approved by Apple, you may find that your jailbroken iPad crashes more often or that certain apps don’t work smoothly.
Shortened battery life issues on jailbroken iPads may be caused by installed third-party apps and tweaks.