(Bloomberg) -- Apple Inc.’s attempts to justify the 27% fee it charges developers for purchases outside its App Store backfired as a skeptical federal judge questioned an executive about a company-commissioned study showing half that rate would be reasonable.Most Read from BloombergChina Attempts to End Property Crisis With Broad Rescue PackageA 25-Year-Old BofA Trader Dies Suddenly at Industry OutingWith a BlackRock CEO, $9 Trillion Vanguard Braces for TurbulenceVoters Prefer Trump Over Biden o...

After Apple loosened its App Store guidelines to permit game emulators, the retro game emulator Delta -- an app 10 years in the making -- hit the top of the App Store's charts. But the increased attention also brought the threat of legal action, as Adobe targeted Delta for sporting a logo that looked too much like its own. Delta's game emulator was built by developer Riley Testut, who had begun his experiments in this space by figuring out how to load games onto graphing calculators, before turn...

Apple's iPad Pro is an amazing piece of technology, but it needs the software to keep up...