Dhaka, Aug. 16 -- Apple has rejected accusations from Elon Musk that its App Store stifles competiton, insisting it is "designed to be free and fair of bias."X owner Musk has threatened Apple with legal action after claiming it had made it "impossible" for apps to compete with ChatGPT-maker OpenAI in the store. He also called OpenAI boss Sam Altman a "liar" - after Altman claimed Musk used his platform to "benefit himself and his own companies".The row is the latest flashpoint in what is an ongoing feud between the billionaires who co-founded OpenAI - but now fiercely compete after Musk left the firm. Apple announced a partnership with ChatGPT in June 2024 - but there is no suggestion Apple favours one app over the other, and several rival ...