Sidenote: those clones, and eventually the entire standard PC architecture we know and love today, were possible because IBM fucked up and used common, off the shelf components, with the only proprietary item being their BIOS, which was quickly reverse-engineered. It's not like IBM wanted to shower the world in third party PCs that weren't theirs. That's why they tried again to lock down the market with the PS/2, but failed to dislodge the PC.
In a different universe, we might all be using Acorn or Amiga today.