There's a huge amount of websites that don't need a CDN (my blog has frontpaged multiple times without one). And for many (all?) of the rest you'd be fine with

There's a huge amount of websites that don't need a CDN (my blog has frontpaged multiple times without one). And for many (all?) of the rest you'd be fine with 3-5 regions. CDNs increase latency for low-traffic sites.