If Eve were green-fielded today, there is a 0% chance they would choose Python anywhere in the service layer for an online game. Zero chance.

Python is a fantastic "glue" programming language. A duct-tape language. It's awesome for little scripts, or for gluing together some AI scripts, where you're basically atomically gluing a series of calls to giant native C/C++ libraries like pytorch that are then doing a series of calls to giant native C/C++ libraries like CUDA. Where the overhead of python is negligible compared to some heavy lifting being done by a better language/system.

The simple fact that we're talking about a service that was stuck on Python 2 two decades after it was replaced, half a decade after it was fully deprecated, reveals this to be 100% just debt. The fact that they talk about millions of lines of Python code, and that Python 3 represents a big speedup for their operations, again betrays it to be nothing but debt. They have Python code in the critical flow, not just as a light glue over intensive code, and they have almost certainly spent untold dollars on extra hardware, delivering a worse experience for their users, because they had a "python enthusiast" in a critical position decades ago.