rate-limiting to core as a part of this year's GSoC. The project is listed on
this wiki page.
The main concern is, paraphrasing @claudep, that it would be very easy to introduce DoS
vectors to pretty much all Django applications if rate-limiting is not used/configured
properly. If users currently use a third party application to implement rate-limiting, its
security is their responsibility. But if we add rate-limiting to core, it would become our
responsibility to make sure that we don't introduce DoS vectors to unsuspecting users'
applications.
I would love to work on this project, but I wanted to address this risk and confirm that this
project is still viable.