I think thats plausible, but actually I think its to minimize support. They know that a PC sold with DOS is not going to be used, the buyer is going to install

I think thats plausible, but actually I think its to minimize support. They know that a PC sold with DOS is not going to be used, the buyer is going to install their own OS, therefore no support. The danger of including Linux is then grandma is going to call about why can't she login to her church website, why doesn't email work, x 1000 other things.