I think that free blockchains are very attractive to have a lot of users. Free blockchains are attractive for developers of apps. Users of the dapps will not have extra expenses.
Can't disagree with that, there are use cases where fees are ok to have, insurance contracts tokenization of equity etc. But I can't imagine retail facing dApps that just use the blockchain as backend to require fees for every transaction.
Now because big commissions cryptocurrency is not used for retail at all. Also in many countries cryptocurrency is not regulated. Confirmation of payments in Bitcoin takes a lot of time.