Earlier quoted context omitted.
I'm not sure the everyday person actually can get or even handle real time data. I spoke to someone about 4 years ago who was doing it for their startup and they said they had serious problems handling the data volume. Talking about terabytes of data coming in per day. Typical DB systems fall apart under that kind of load.
I'd like to understand a bit more about how Bloomberg Terminals are set up from an infrastructure perspective. Apologies if you don't know anything about that, but the idea that there's just "so much data" that only a Bloomberg Terminal can handle it seems kind of suspect to me. Don't we have other options? Or is this all proprietary?
In addition there is data that only they have because it's generated as a by-product of their trading functionality. If I'm MegaBank Corp and I want to sell e.g. credit default swaps denominated in Norwegian Krone, I can advertise this by feeding my prices for such deals to Bloomberg so potential clients who also have a BB terminal can see them and click a price they like to make a trade. This gives Bloomberg a pool of liquidity/price info that no independent source has access to.
So there are very strong network effects. Even if you could spend the billions to duplicate the infrastructure and rewrite all the software required, to actually do the same thing you would also need to replicate all the business relationships with data sources.
Disclaimer: I am not a lawyer/cat/financial-advisor/etc, but I used to be a developer at Bloomberg :-)