30 hours per week for just 2 courses? Are these courses covering more than a typical university?
In my undergrad, I took a minimum of 5 courses per semester (16-20 credits). Scaling from your expectations, that would be 60-80 hours per week? I doubt I went over 40/week, including lectures (admittedly, it wasn't a demanding university).
Just giving you my 2 cents so you don't assume that the time you spent per course is all that different from a traditional university.
My only worry is the Math course. Not having gone to University or high school in 20 years I'm fearful. The other courses have been easy so far though, but like you I'm working on the field, so it's not so new to me.
I'm happy I went through them, but yea, MATH1201 was kinda difficult and MATH1280 was super boring (but not as difficult to be honest).
On the other hand, I've had small classes worth only half the credits, with absolutely ridiculous workloads.
I got a bachelor in a normal university while having a full time job in the last two years. I see no issue about this point.
The tuition-free part is more of a marketing. At the end of the day, it cost me $4,060 for the whole degree which is quite reasonable.
Speaking of employment and red flags, from LinkedIn I know that those who had studied at UoPeople work for many big companies including FAANG. No problem here.