Why Agar.io and Slither.io Bet on Node.js, WebSockets, and Canvas: The Boring Web Stack Behind the .io Boom

Why Agar.io and Slither.io bet on boring Node.js, WebSockets, and Canvas instead of Flash or Unity, what 500-player shards gained and cost, why bandwidth bills mattered more than clones, and what indie devs can steal — with original analysis and browser trainers.