Normally I think it's lame when a product-for-a-product (there's probably a better term) has to abide by stringent branding guidelines to not look official. e.g. when third-party reddit clients (RIP) had to change from e.g. "Reddit Sync" to "Sync for Reddit" and they weren't allowed to use the Snoo character in their branding.

But in this case... why was Discord fine with this branding? It looks unabashedly like an alternate official domain for their own service. Googling "what is discord.io" leads to a good handful of confused redditors asking if it's legit/safe.

And discord.com !== discordapp.com or discord.gg.