You could make the same argument about changetip, coinbase, bitstamp or any
other entity that operates off chain transactions.
1) There is probably no way of blocking them or enforcing fee collection
from entities that operate off chain transactions
2) They all have to settle on chain eventually
>Again – what does Bitcoin have to do with “market liquidity” and “capital
requirements”?
You seem to be conflating bitcoin with blockstream/liquid. Your question
does not make sense.
>Does Blockstream have commercial products now?
Yes. I am sure that was always their plan in order to stay a via
