(1) WASM can be blocked with regular ad-blockers (just like JS) (2) you can't do anything in WASM that you can't also do in JS (and the performance difference

(1) WASM can be blocked with regular ad-blockers (just like JS) (2) you can't do anything in WASM that you can't also do in JS (and the performance difference is hardly noticeable either for well-optimized JS)