Most teeth align themselves as kids age. This is almost never necessary.

Yes, the 12 billion dollar company must be doing something that no one needs.

There are folks working on solutions for when teeth do not align themselves.

"almost never" for 8 billion people is "hundreds of millions of people need this".

E.g. I do

Depends on diet.

If you keep them on soft food young, the jaw muscles don't get stimulated enough to grow so that the teeth that are coming out sit properly. Misalignment and opportunity for decay ensues.

If you give them decently hard food early on in life you solve most problems.

After that it can still happen but there's less chance.

Until wisdom teeth come in later on and cause crowding or visual issues

Ok, sure, it's usually cosmetic. So what?