several other examples as well, but the worst thing they do is very frequent breaking API changes which force companies to do maintenance work to adjust to Google
I believe you when you say they play fast and loose with the APIs. I've mostly suffered from the lacking documentation for the SDKs, they are often autogenerated and just plopped out there, with mutually contradictory sets of documentation scattered around the web.
several other examples as well, but the worst thing they do is very frequent breaking API changes which force companies to do maintenance work to adjust to Google