The billion was the rewrite, not continued maintenance. So billion over around 7-10 years (the early releases greatly lacked features but some of the features h

The billion was the rewrite, not continued maintenance. So billion over around 7-10 years (the early releases greatly lacked features but some of the features had maintenance work done and additional features added while other parts of the rewrite were in progress). But yes at least 200 developers have worked on the project every year, not to mention a lot of testers and such. this is normal for all the different companies I've worked at. you can perhaps guess based on my comment history but I'm not supposed to state directly.