I would have to say yes. It's a lot easier to break something that is has the code/methods available then play the hex guessing game.

But having an application which is 100% HTML/JS/CSS/Interest other scripting language here. Without any ability to opcache or byte code it and encrypt it. It's not going to take much to crack it.

If they somehow found a way to compress+encrypt the HTML/JS they may be able to make it at least a little bit more challenging. But that would take a lot of effort.