First up, people who call Bloomberg Terminal a "$25k/year chat terminal" are utterly clueless and have evidently never seen or used a Bloomberg Terminal.
The main reason Bloomberg costs so much is because unlike their competitors, Bloomberg have a "one-size-fits-all" price. You get all the data (except live data that is subject to exchange fees levied by third-parties such as NASDAQ). Contrast this with Bloomberg competitors where you spend days haggling with your neighborhood sales rep over a list of indecipherable package options (which almost always end up costing the same or more as Bloomberg by the time you add everything you want).
Secondly, hardly a year goes by without one of these "Bloomberg killers" popping up. The trouble is its nonsense.
Most of the so called "Bloomberg killers" only offer a subset of features, for example they only focus on charting. Or they only offer limited market data (e.g. US market only).
Also, most so-called "Bloomberg killers" rely on second-rate data feeds of poor or questionable quality. Services such as Bloomberg (and those of similar tier, e.g. Eikon) spend a lot of time and effort procuring first-class data.
So, don't kid yourself with the ludicrous dream of thinking you can replicate Bloomberg (or Eikon or similar) and sell it for a fraction of the cost (or give it away for free).