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> I believe Cloudflare is the only FaaS that offers that

Wasmer also offers the same (charging only for active CPU usage), with the advantage that you can run full Node.js and Python workloads

And there are even hibernateable websockets too - only paying for when data is actually transferring.

And the maximum worker time is based on processing time, not wall time.

Lambda Web Functions, per the article, and Vercel Fluid Compute also do this.