Hi,
the problem here is, that there is either a way to play in a proper key, or a way to play it as easy as possible. And I'm focusing on the second way. As long as it is as easy as possible for beginners, it's there to go.
The strange keys are a result of transposing the song to the key, that has the lowest amount of sharps and flats, because new users really have problems with them, as far as I have figured out.
I got some people to buy themselves xaphoons and they're all but one, total beginners. The tabs without sharps are the most played. Of course, if you want to play in a band, you'll have to transpose it.
Those tabs are meant more as a little starting help, than accurate sheet music. See it as a musical scratchbook of ideas.

And you're right...playing low Eb is a thing for itself. I don't get it sounding right about 60% of the time.