Many of these programs are small but not exactly lightweight by browser standards. This is cool, so I applaud the efforts but this is also dangerous IMO because many entry level developers go out in search of solutions not knowing about optimization and eventually what was meant to be fun but not serious ends up becoming the norm. Converting optimized videos already supported by the browser to sub-optimized images to convert back into bloated videos is just insanity IMO, but could quickly become the norm for how websites operate if we are not careful with WASM... and it does come at a performance costs, whether bandwidth or complexity... and I for one, as much as I despise JavaScript, like that it is at least semi-transparent. How long before we have people reverse-engineering WASM programs just to read what is happening in your web browser which has already became the preferred tool for fingerprinting and gathering user information? Malicious advertisers will see WASM as the holy grail.