[UnoriginalGuy]

This attitude is tiresome and unrealistic.

There are a lot of businesses based on iOS/Mac app stores, Play Store, Amazon's EC2 infrastructure, Amazon's seller marketplace, eBay/PayPal, reselling (e.g. domains, hosting, etc), which won't meet your criteria.

Now let's look at non-digital goods: All new car dealerships, every shop in rental space (which is almost all of them), all airlines, in fact all airport-located businesses, government contractors, all franchises, et al.

So what businesses exist which aren't reliant on a third party? If we ignore government as a "third party," there still aren't very many. Most businesses rely in some part or a large part on a third party.