you should try Bisq first before you are coming to a final conclusion and see for yourself if you actually like it or not.
it is a true DEX, has TOR inbuilt, and is better than trading in a browser. no malicious little plugins, no phoning home, sneaky ref links or other hidden shit.
it is basically an all-in-one trading software (unlike just any other mobile crypto app).
Trading through a web browser means using a web server, which would centralize Bisq in that server.
So, that would defeat the purposes why Bisq was created.
However, what you mean already exists at:
https://hodlhodl.com/Why do you think the VND market makers avoid creating liquidity there also?
There are some root causes I can see from the side of locals:
- Do neither care about centralization or decentralization: What they need is a good exchange with good volume, good chances to get profits from investment or tradings. Centralized or decentralized exchanges are not matter with them.
- Don't care about their privacy: with KYC requirements and such.
- Privacy is not a big matter with them.
- Local laws do not strickly restrict bitcoin and cryptocurrency
To sum up, the local target customer population don't care too much about technical things, privacy, etc. and they tend to choose to use biggest exchanges.