Avoiding the use of a framework does not preclude someone else from duplicating your work in two months by using a framework. It just means that you wasted a whole lot of time hand-rolling things that didn't need hand-rolling.

Most businesses are not successful by virtue of the technologies they choose. Facebook is probably the foremost example here; they started with PHP and moved over time to leverage additional technologies (some homegrown like hack and react, others just additional languages like C++).

There are plenty of facebook clones in plenty of languages. The technology isn't the reason Facebook hasn't been supplanted by a competitor with the exact same product.