Deciding on how to learn your craft but to pursue formal education in art school or self-taught?

Not many people have the luxury to attend college/university. So, let's say if one has a huge load of commitments and unable to afford tertiary education; can't pass for education loan or can't even score scholarship..
Will it be alright to self-taught from sites like Youtube, Skillshare or Udemy; then slowly create your portfolio overtime?

In creative industries, is it really important to earn atleast a diploma to score a job?
If self taught, what are the chances of getting a job in a big company? Let's say a comic artist trying to score in Marvel? Or for a local example, an animator in Animonsta studio?

If wanted to be self taught, is learning your skills from the internet would be sufficient? Is there any tips to self-learning?

What are your views on this? Pros and cons?