Don't be obtuse. The grandparent poster was talking about the problem of being locked into an individual vendor's platform - a problem which does exist in many market sectors but can also be mitigated by the ancient strategy of not putting all your eggs in one basket [1]. Defining a problem out of existence is not really illuminating.
1. This is a metaphor, in case anyone else is feeling pedantic and wants to challenge the notion that eggs are commonly transported in baskets...
Search discovery: Google, Bing
Social promotion: FB, Snap, Twitter, LinkedIn, Reddit, etc
App & software stores: Apple, Google, Amazon, Microsoft, Steam
General commerce: Transaction networks, Paypal, banks, etc
Online commerce: eBay, Amazon, Etsy, Craigslist, Zillow, Priceline, Airbnb, Alibaba, hundreds more
There's nothing new about this. All businesses utilize platforms they don't control. There are no exceptions.
Radio, TV, newspapers, mail catalogs were discovery and promotion before Google search was. The dependency was just as high.
Want to open a hotdog stand or a gas station? The absolute minimum platform you'll be dependent on will be local political system/s in dozens of ways (infrastructure, zoning, health laws, employment regulations, and on and on).