Also, lots of open source software only achieves widespread use because they are open source. If e.g. Daniel Stenberg had decided to charge for curl instead of

Also, lots of open source software only achieves widespread use because they are open source. If e.g. Daniel Stenberg had decided to charge for curl instead of releasing it under a FOSS license, very few would have bothered to use it, and in all probability, some other person would have written a FOSS replacement for it.