Because it makes it even harder for users to take apart websites and understand them.
I’ve actually done that to research and break some systems, and webasm is an order of magnitude worse than JS.
I mean, this is the reason why patents were invented originally: You publish the way your technology works, in return, after a short term, everyone can use it, which improves innovation.
Yet, nowadays, a lot more is done via trade secrets.
It would be awesome if we could get that innovation back that we’ve lost.
For some people the alternative to closed source isn't open source, it's either "not publicly published" or "not developed at all", which actually slows development down.