I think it has very little to do with the end-user hardware, and everything to do with their data. Bloomberg is dominant in data quality. Really, whatever financial information you want, you can get, provided you're willing and able to pay the price.
Their data is faster and cleaner than most of their competition. Personally, I find their interface clunky by today's standards, but it's entrenched in the industry, so there's a non-trivial learning "cost" for anyone considering switching away, and even if they're able to adapt to a new interface, they're likely to find holes in the available data. Beyond their data, they connect the financial industry over Bloomberg chat, so it's got the network effect there. The hardware itself is not a huge factor IMO. Plenty of people use Bloomberg terminals, via Bloomberg Anywhere, logging in from their standard desktop with their normal Windows keyboards.
Their data is faster and cleaner than most of their competition. Personally, I find their interface clunky by today's standards, but it's entrenched in the industry, so there's a non-trivial learning "cost" for anyone considering switching away, and even if they're able to adapt to a new interface, they're likely to find holes in the available data. Beyond their data, they connect the financial industry over Bloomberg chat, so it's got the network effect there. The hardware itself is not a huge factor IMO. Plenty of people use Bloomberg terminals, via Bloomberg Anywhere, logging in from their standard desktop with their normal Windows keyboards.