Is using Android really your idea of learning Linux? iOS is a Unix variant too. Do you really think those facts are in any way relevant to the learning experience of children using them? That's pure technological partisanship, based on an agenda that has nothing whatever to do with education.
Linux is a commons resource. ABSOLUTELY, children should know how they can use the commons resource they have available to them - anything else, and you set up future generations for even more corporate control.
In case you're an un-educated American who doesn't know what the commons is, and why Linux is such an important resource when viewed from a commons perspective, educate yourself:
http://en.wikipedia.org/wiki/Commons
I know that commons is anathema to American industrial thinking, but alas .. this is precisely why its important to educate our children on what rights, responsibilities, and resources they have available to them. Linux is a very, very powerful tool which belongs to everyone. Microsoft Windows belongs to the shareholders of Microsoft - and nobody else.
You see, your argument doesn't really work in your favour, either - because cars have been following the computerization model (or is it the other way around) for years .. whereas you once could have worked on your car, now its completely locked down, you need special proprietary tools to work on it, and you're not going to be able to function as a driver without further investing in the infrastructure. A pity, as it used to be that kids in their teens could repair cars, if they need to.
Do you really think your position improves society, or perhaps it just serves to justify its current state of utter incompetence?
Androids is a Linux computer.
Learning linux is vital - because Linux runs everywhere, and almost everything!
Been on a train in Europe? Your life is being protected by Linux. Made an Internet connection in the USA? You're using Linux, somewhere.
Teaching kids to use the Linux OS should be as equally valid an approach as teaching them Windows. The Linux ecosystem is as equally viable as any other - so why should kids miss out on the value of this technology, just because a corporate lackey has managed to make a deal with school administrators?
Inverse-Totalitarianism!