Mom and pop are the consumers/victims here. And if 46% of all websites are WordPress, it’s probably likely that it has a monopoly on sites in its domain (e.g. blogging, commerce)
For competitors, on the small scale side, you have Wix/Squarespaxe/Weebly. Or just Shopify for e-commerce. For enterprise, Adobe experience manager is huge. Loads of places just write their own website and have their own CMS solution.
So no, it doesn’t even come close to having a monopoly on anything. And even if WordPress did, no individual company does. There are a huge number of different companies competing in the WordPress hosting space. Automattic doesn’t even host that much (https://w3techs.com/technologies/details/ho-automattic)
So, while you're right - online publishing doesn't have popular mindshare - it is a massive part of the online economy.
I'm not saying that qualifies WP for anti-trust investigation, but your underlying premise that WordPress is irrelevant is not congruent with reality.
From an internal tablet tool for sales reps, to the entire help system for an MS product that got translated into iirc about 100 languages, to a shareable library of B2B solutions, I’ve not once worked on a WP project that was a blog.