[houjieth]

Because they are all legacy code. No one wants to do the cleaning work.

[brudgers]

More importantly, no one needs to do it.

And most importantly, no one is allowed to do it because it does not need to be done.

White space is free as in beer (when all the bandwidth available for AWS is a sunk cost).

[elclanrs]

Exactly. Don't expect your HTML to be perfectly indented unless you're writing that HTML yourself, but most people don't, an Amazon surely doesn't. The HTML is generated server side.