Did we forget the countless services Facebook and Google have dramatically altered or killed over the years that can never be forked or restarted elsewhere beca

Did we forget the countless services Facebook and Google have dramatically altered or killed over the years that can never be forked or restarted elsewhere because they are proprietary? The only services we should assume are reliable are the ones that directly generate profits. I expect neither company will shut down their ad selling systems but everything else I would not consider reliable.