Yikes! and to think there was a time when MongoDB was even worse than it is now (which is still worse, but better). I just struggle to fathom why anyone uses MongoDB or similar NoSQL databases with similar problems for production purposes. If you want a real database, use one that has been around for a long time. MySQL, Microsoft SQL Server or PostgreSQL are far better choices.

Having said that, I do use MongoDB, but I do not use it in production. MongoDB is great when you're prototyping an application and you do not know how your data will be structured, when you want a database you can store stuff in and test. There are very few situations that require a solution like MongoDB to be used and for those times, there are far better solutions out there.

I hope Stripe are not using MongoDB for anything mission critical (or for anything at all) for that matter.