Shoeshiners are for "nice" shoes that use primarily "hard" materials for the outer layer that can be, well, shined. They don't typically take care of the inner parts where more standard fabrics are nor do they do sneakers.
Sneakers you can toss in the washer and call it a day
While Google should open source it, it's important to note that Google never actually wanted to run or implement RCS. It was supposed to be the carriers, but they never did and even Google spent years pushing them to get off their ass and they still didn't. It was years before Google finally went "Fine, I'll just fucking do it myself"