If the two rival businesses are trading real world things, they each need a database and the actual situation of the trading has to be established by real-world paper trails or whatever.

So basically, the only use-case of the blockchain is "virtual currency" like bitcoin and we've seen that these "virtual currencies" doesn't actually operate as a practical currencies but rather a speculative investments and means of laundering money/control-of-sources (if you have free electricity, you can turn it into cash at a cost to the planet etc).