This article lists a bunch of the special deals Google made with various companies in order to prevent competition https://www.theverge.com/23959932/epic-v-google-trial-antitr...
> One Google Play exec boasted she got Riot to halt development on its own app store by promising the company $10M in marketing.
> Another Google exec suggested that sharing revenue with Samsung would be “better at disincentivizing other app stores from being preloaded.”
> Google wanted to offer a 16 percent Google Play revenue share to key Chinese OEMs to “secure Play exclusivity” — and wound up giving them 20 percent.
> A secret Google deal let Spotify completely bypass Android’s app store fees
Apple made significantly less of these deals - they have their rules that you can either follow or not participate. I do think that some of those rules limit competition and make worse products for consumers.