Apple isn't getting sued because they are selling you the hardware and the software. Hardware vendors are not required to provide you options in terms of their firmware. When was the last time you tried to replaced the OS of your DVD player?.
The most current relevant example is Sony's Playstation 3. They have their own browser built-in to their gaming console and you have no other options or choices. With the recent news of the USB dongle that would allow users to install homebrew software on the PS3. They had the seller of those units arrested.
Microsoft and Google are only selling you their OS. The computers are made by Dell, HP, ASUS and the phones by HTC, Motorola, and Samsung. Whether this is morally right or wrong, I'll leave that to the consumers. They can buy what they like.