If they decided to remove the 0.3% fee and made Ginger Wallet a free service, it would probably increase the number of people using it. For now at least, Open Coordinator (opencoordinator.org) is not charging a fee and they have a 24 hour figure of just 1.18 BTC. Kruw coordinator also does not charge a fee and has 1168 BTC.
At the same time, Ginger Wallet has 0.17 BTC therefore their business model is not working. The details can be seen on the
Wabisabi Coordinators List at Wabisator.
One thing I have noticed about the Wabisabi Coordinators List is that whenever I visit it, the source shows that no coinjoins were done using the coinjoin.nl coordinator. Even its history shows 0 coinjoins performed in the last 7 days. It makes me wonder if this coordinator is even working or if it's that unpopular that no one even wants to give it a try. If it was offline for a lengthier period of time, it would surely have been removed from the list.