But there's none available options as the API is proprietary. Do suggest one that works here as an alternative.

that isn’t what he asked at all. Virtually zero people are ever going to manually run and specify their own caching server and you know it. “You can run our proprietary daemon that ONLY we use in the whole world and manually type it into your client, it’s incredibly simple to not be censored!” This is no different than libtards circa 2017 who were shouting “just run your own social media service!” The point is that there is clearly no effort on your part to ever delegate this central control over Nostr that you’ve claimed for yourself.