I think Vercel and Netlify aren't aimed at developers, because if you are a developer and are using Vercel and Netlify you are literally getting robbed.

Bandwidth costs are 40x-50x more expensive on Vercel and Netlify that the vast majority of cloud providers. Cloudflare bandwidth is barely a cost.

Edge function calls are 6x more expensive on Vercel and Netlify than Cloudflare. Not including compute time costs which is free on Cloudflare.

I think the only reason Vercel is even popular is because it's by far the best place to host NextJS and that might be why they make it hard to deploy NextJS else where.