IIRC they have a minimum payment. You need to put $5 in your account. Not sure what they do if you pay by subscription and only use a few hours, but when I was using DO, you needed to fund your account with $5 even if you were using the $100 free credit from GitHub education.
I would guess HBO registered SeeFood Technologies Inc. as it definitely looks like an official stunt otherwise it might have been taken down by now. It's not uncommon for them to do this - see http://www.piedpiper.com/ and http://raviga.com/
As far as I can tell, mitmproxy is very capable, but requires a lot of configuration to use effectively, and the interface isn't exactly brilliant. I've been using Charles for a while instead of mitmproxy just because it's quicker to set up, I'm much more productive with it. Looks like this app will be similar.
Exactly. A lot of people don't know that you can easily crack a .ipa binary and see things like method names and string constants with about 5 minutes of work. You can do the same with Android .apk files. Seriously, if you're doing security intensive software, try to crack your own binary and see what information you can get. You'll probably see way more than you thought you would.