Render includes Cloudflare by default. This great, but it also breaks one of the core functionalities of our product. Val Town receives JavaScript code that we want to run. We've built the infra to run this safely - it's like Observable or RunKit. But given that Render has our site behind Cloudflare's WAF, these requests are blocked, and we can't configure the WAF to do differently. It's a pretty bad issue that produces an unfixable bug for us.