Does all American sports book electronic wagering require an iOS or Android device? Why?

It seems to me that if a person can bet hundreds of thousand of dollars on their favorite Wall St. stocks and options from their brokerage accounts, they should be able to bet on sports the same way, especially since we know they have the technology cause that's what offshore sports books are doing. Armed with a computer with Windows or Mac OS and a browser, you'd good to go. 

Perhaps there are states where you can. If so, which states? And if they can do it, why can't all states where electronic sports betting has been legalized do it?