Apple’s restrictions on mobile browsers are limiting innovation and holding back new features that could benefit iPhone users, according to provisional findings published today by the UK’s Competition and Markets Authority (CMA). From a report: In its report, the CMA’s independent inquiry group determined that Apple’s Safari browser policies prevent competing browsers from implementing certain features, such as faster webpage loading technologies. The investigation also revealed that many UK app developers would prefer to offer progressive web apps as an alternative to App Store distribution, but Apple’s current iOS limitations make this impractical.

Adding to competitive concerns, the regulator highlighted a revenue-sharing agreement between Apple and Google that “significantly reduces their financial incentives to compete” in the mobile browser space on iOS. The CMA also found that both companies can manipulate how users are presented with browser choices, making their own offerings appear as the clearest or easiest options.