Trade in personal data is a promising branch. Why will the tokens be burned? What will happen when their price rises due to this burning? Will not this complicate the data trade? Will the system stop when all the tokens are burned? Why do fire tokens in general, except for one purpose - to raise their value? Is the project aimed at providing data trade or increasing the value of its tokens?
Price of data is quoted in USD against the current exchange rate of DAT, just like most platforms where you currently trade goods for BTC, on these platforms prices are not quoted in BTC but rather in USD.
Generally speaking appreciation of value of BTC and other Coins/Tokens is not a negative, quite the contrary.