1) You probably already have Redis running
2) Adding a "good enough" rate limiter is easy
3) Faster solutions are usually more work to maintain given modern skillsets
If you are a b2b SaaS company odds are your company will exceed 10 billion in market cap looong before Redis rate limiting is a meaningful bottleneck.
Otherwise, how can you determine that "North" is a context change, but not always a context change.