You choose your university subject between the ages of 16 - 18 and with the best will in the world and with input from family friends and careers advisors the choice can be wrong, because between between 18 and 21 an individual changes a lot, they, mature there views of what they want to do, the course they thought they understood turns out to be other than it appeared. Even if they graduate happy with their degree the world of the career they had planned may turn out not to be what they expected it to be so they chop and change until they find what suits them.
The idea that a degree is wasted because setting up a business is something anyone can do reminds me of the argument against educating women, education was wasted on them because all they were going to do was marry and raise children.
A university education teaches you to research, analyse and assess information. These skills are invaluable when setting up in business. It is a help when assessing market information, dealing with banks, lawyers and accountants, negotiating leases, perhaps learning quickly the skills of a new craft, say cheese making. Read the stories of successful business men who did start with little education. How often once they got the business off the ground its continual growth was highly dependent on professional advisors with the necessary degrees and professional training.
No education at any level is ever anything but a life enhancer, however you choose to earn your living.