It looks like Discover Weekly is not longer accessible.
Trying to get it by ID returns a 404 and searching or getting playlists returns a list with a null value where I expect the playlist to be.
It's kind of new. The second bundle included the first one by default for a while and eventually the added the "pay more than average" trick. It's an entirely different game to start it that way from minute one.
I don't remember that it was included by default. When they decided to add it, they offered it to existing customers and made it available for new customers if they paid more than the average price.
They made it clear:
"For all ~180,000 customers, this is complimentary."
and
"For new customers, we're trying an experiment: to unlock the Humble Bundle #1 inside of your bundle, just choose a price that is above average"
From what I remember, what I got (I think it was the second bundle) was only the second bundle. Then, after a few days, they emailed me to say "since you paid more than average, here's the first bundle as well, free of charge!".
rm: use --no-preserve-root to override this failsafe
Brilliant, at long last at least a bit of protection! :) Sadly, I can still remember doing this to my one of my first Linux installs, albeit via the classic:
rm -fr .*
On the plus side, that day I learned one hell of a lot about how Linux works ;)