I don't see it as a problem for those projects to be buying Bitcoin as reserve, already, it is a form of backup investment strategy that can sustain the stability of their own company incase of any crisis that may happen in future. One of the major changes that do occur in those projects are mainly change of chain, if it happens that ADA and Polkadot chains are not reaching it's target, they can equally change and deflect to another chain and that could cost lots of funds.