An imperfect solution to this discount rate problem would be to look at any equity valuations of the company. So venture capital rounds. You would then estimate the value of Kyber if it was processing 5% of all the crypto transactions (and crypto continued its growth path). From Kyber's current equity valuation and future possible valuation you could derive a discount rate. This isn't a perfect solution for a number of reasons, but it is the best I can think of off the top of my head.