A product - in this case, software - is supplied from a supplier, or vendor, to their customer. Is this business 101?
The usual worst case for the supplier is that they give the product but don't get paid, and the usual worst case for the customer is that they give the money but don't get the product.
With copyleft specifically, the supplier is much more likely to not get paid, but the customer receives the benefit of being allowed to continue the maintenance of the software themselves if the supplier goes out of business. The supplier hopes this will help them acquire and keep customers, many of whom will pay, and keep them in business.
I understand what a supplier is. I don't understand how it relates to what I said.
> With copyleft specifically, the supplier is much more likely to not get paid
That doesn't make any sense. Whether the supplier open sources their code as permissive or copyleft doesn't have any impact on the likelihood of getting paid.
But if they distribute it as permissive, a competitor can just make a proprietary fork. Possibly continuously importing the new improvements from upstream and focusing on differentiating. Whereas if they distribute it as copyleft, a competitor has to share their changes, that upstream can benefit from.
So for the supplier, if that's how you want to call it, it's better to licence code as copyleft. Except if the whole idea is to be adopted by corporations, but in that case don't whine when they take your code and build a proprietary product without contributing anything back.
The usual worst case for the supplier is that they give the product but don't get paid, and the usual worst case for the customer is that they give the money but don't get the product.
With copyleft specifically, the supplier is much more likely to not get paid, but the customer receives the benefit of being allowed to continue the maintenance of the software themselves if the supplier goes out of business. The supplier hopes this will help them acquire and keep customers, many of whom will pay, and keep them in business.