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Probably better if they make it obvious that you need Workers paid plan:

"Your Cloudflare account is on the Free plan, but the Cloudflare OS backend needs Dynamic Workers, which requires the Workers Paid plan."

This is just if you don't want to host it yourself, no?

Far as I can tell, even if you host it yourself you are still bound to their workers.

which are open sourced [1]. I tried deploying it and had Deepseek v4 Flash create a dumb whiteboarding app.