Because you can take those minor changes deploy to a smaller group where a decentralized exchange is required. For example an ad buying network. Or you can make your own coin and market it.
It's the same as forking facebook's website code if they allowed that. You have a product you can use but without the scale of people and data it would give you a similiar level of value.
People have been downvoting you because you're wrong, but someone should say why: the difference between your two examples is that a social network has some sort of value with a limited network, but a currency only has value where it is accepted.
I can fork Linux right now, make some random changes and I have a fully functioning equivalent system with those minor changes.
I can fork Bitcoin right now, make some random changes to the consensus code, and I have a useless token that has absolutely no value.
These two things, are not the same. How can you possibly refute that?