Of course. Similarly, I doubt Adobe intend for Flash to replace entire websites with over-animated single page apps with terrible usability, but that's how many websites used Flash In the late 90s.
Yes, well-designed sites will use WebAssembly in other more reasonable ways. Entirely separate from that are the websites that try to disable the right-click context menu to "protect" images, and the businesses that are watching there revenue disappear with the rise in adblocking. Some businesses will - often foolishly - use all available means to "protect their content", so that's how they will use WebAssembly.
Yes, well-designed sites will use WebAssembly in other more reasonable ways. Entirely separate from that are the websites that try to disable the right-click context menu to "protect" images, and the businesses that are watching there revenue disappear with the rise in adblocking. Some businesses will - often foolishly - use all available means to "protect their content", so that's how they will use WebAssembly.