To be clear Microsoft isn't directly funding Python, excluding any PyCon sponsorship.
Microsoft hired Guido in late 2020 giving him freedom to choose what project he wanted. Guido decided to go back to core Python development and with approval of Microsoft created a "faster-cpython" project, at this point that project has hired several developers including some core CPython developers. This is all at the discretion of Microsoft, and is not some arms length funding arrangement.
Meta has a somewhat similar situation, they hired Sam Gross (not the cartoonist) to work on a Python non-gil project, and contribute it directly to CPython if they accept it (which they have), and they have publicly committed to support it, which if I remember right was something like funding two engineering years of an experienced CPython internals developer.
Microsoft hired Guido in late 2020 giving him freedom to choose what project he wanted. Guido decided to go back to core Python development and with approval of Microsoft created a "faster-cpython" project, at this point that project has hired several developers including some core CPython developers. This is all at the discretion of Microsoft, and is not some arms length funding arrangement.
Meta has a somewhat similar situation, they hired Sam Gross (not the cartoonist) to work on a Python non-gil project, and contribute it directly to CPython if they accept it (which they have), and they have publicly committed to support it, which if I remember right was something like funding two engineering years of an experienced CPython internals developer.