Umm, yes? BCH is a shitcoin, and if you disagree, you can always fork Bisq. That is the whole point.
So if coinbase was open source, and you had forked it to add BSV support, that’d mean coinbase was decentralized?! Open source/forkability != decentralization. The whole point of decentralization is no particular entity gets to decide something for everybody, and that’s precisely why it’ll take a long long time for regulators to be okay with it.