How do Bitcoin Wallet developers make profits from creating Wallets.? (Non Custodial Bitcoin Wallets).
Donations for the good wallets. People that write good bitcoin software are likely to also have large bitcoin holdings already.
Don't they also run the default centralized coordinator thing and receive a commission from the mixing transactions?
There is also the cooperation with blockchain analysis (anti-privacy) companies which I'm sure generates the Wasabi team a good additional revenue...
You must have lost the last episodes. The default coordinator (zkSNACKs) has been shutdown. People now use Kruw's coordinator, which is free and has large volume.