Using cracked software is illegal and takes revenue away from developers who create powerful tools.
An file is essentially a zip archive containing an iOS app's data. A cracked IPA is a modified version that has been altered to bypass Apple's licensing and payment systems. Searching for such files leads to a landscape fraught with risk. While some websites and forums claim to offer these files, the potential dangers are severe.
Yes, this method reportedly worked for some. People who tried it claimed the app launched and functioned without an Apple ID login. However, there are to consider: