WPUA appear to actually be a small/specialized web hosting operation, offering site-hosting at a substantially higher cost than normal, justified by seeming to provided a WordPress-centric resource & support environment. ***

Both their "Become A Member Now" button beneath the introductory come-on at the top of the homepage, and the "Join Now" button at the bottom of the Basic Membership box near the end of the page, lead to the Join Now page. This page is a big table displaying the features of the product-offer, and upon scanning down the table it jumps out like a sore thumb (about the middle), that all the glitz and song & dance really boils down to simply a web-hosting contract-offer.

This is why we have WordPress-dot-COM! Because remote hosting is still too scary for many folks. When the website product (WP) aims for those who are less technically adept, the seeming-rigors of typical remote shared hosting become a barrier that too many cannot surmount.

Sooo ... WordPress themselves will give you a remote-hosted WordPress website, fully-installed & working, remotely hosted on their servers, with free themes and plugins you can add, so you don't have to engage with remote hosting, mano-a-mano.

That is your basic clue, how much it really costs to offer & provide remote shared hosting. It is so cheap, WP can afford to give it away.

... Or, alternatively, you can give these folks at WPUA in the vicinity of twice what a normal remote hosting contract should cost, for the privilege of having your website tied to their confusing & opaque hosting-service.

*** There are various legit people & businesses who cater to those who want someone to 'take care of all the stuff' associated with having a website, for them ... and they often do something technically similar to WPUA, without all the hucksterism. Small businesses without web-skills, for example, and charities, and political action groups, and missionarys are known to gravitate to these kinds of services. They are as a group scrupulously ethical, and provide a valued service.

99.99% of everyone else who can't face remote hosting, simply go to WordPress and take one of their free sites.