No, I can't imagine someone trying to sell the idea that anyone can design and build a bridge.

But a website is not a bridge – the stakes are low, and yes, for many basic use cases, Squarespace suffices as the intermediate that enables "anyone" to build a website.

Actually, revisiting the bridge idea – for a sufficiently small creek, yes, anyone can design and build a bridge (simply chop a tree and fell it across). So I guess the question becomes – what kind of bridge are you asking for? A bridge designed to support large volumes of cars absolutely requires specialists, and those specialists should feel no fear from the companies that sell plywood to toss onto creeks.