This is such nonsense.
There are more alternatives now than ever. Name any service provided by FANAMNGS (or whatever acronym we're using today) and there are many alternatives. Shit we even have viable alternatives to iPhones and Androids.
Now if you need AWS level quality of service, you're gonna have to use a service provided by a company that has the means to provide that level of service. The difference is, 20 years ago, that level of service was just not available to your average person/company.
If you're talking about social media, then yeah, social media NETWORKS rely on having everyone on the same platform. It's easier than ever to host your own Geocities equivalent, if that's what you wanna do for some reason.