They are leaders in their domain, no doubt, but they sold any remnant of a good culture to get there. I would count your blessings, I'm sure they would pay well but I'm equally sure the job would be soul sucking. This is just flag number 1.
Unreasonable is anything where it only costs one side, for example, or if unduly burdensome on one side.
It's like -- you literally told them to not value your time, and now you're going Pikachu face.
I have done them in the past, I think, so I'm not above it, but I do think we should call out the incongruous thinking, if that's the phrase.
If you/we think are owed anything for unasked work, you/we have to let go of expectations.
If you're to work on a test like this, approach it with "overcome challenge" mindset and not with the open hand of "you owe me something."
Sorry, I can't resist.