First, education, in any form is valuable. I knew nothing about this UO People before seeing this post, and if they are offering free or very cheap educational curricula, then there is inherent value in just the ability for people to learn. HOWEVER.....
When most people, in the USA at least, think about college and university it is with the understanding that it is an accredited institution. UO People makes many claims on their website about being accredited, but I could find nowhere on their site where they say which accrediting body they are under. This is a huge red flag. Any properly accredited college or university would proudly display who they are accredited with. Further, in the USA at least, when a student is looking for an accredited college or university they are looking for a regionally accredited one. UO People doesn't NOT appear to be regionally accredited.
So if you're signing up with this organization to learn free or cheaply, it maybe a great way. Again, I'd never heard of them before this post so I can't speak to their offerings or education. If you're looking for a college or university degree as recognized by most people, organizations, and employers, this isn't it.
EDITING TO ADD: Lots of discussion has occurred on this place, and I encourage any reading this to form you own conclusions. The more I look at the place the more scammy it looks. Here are two sources. One apparently to be an actual former UO People student detailing their difficulties and surprise extra fees.
sources:
University of the People uopeople.edu, also known as "University of the Scammers"