[routing-wg] Public RPKI RTR Validators

Hello everyone, I'm looking for recommendations for reliable public RPKI RTR (RFC 8210) servers, excluding Cloudflare. I know the common recommendation is to run my own validator, but in my particular case I'd prefer to use one or more independently operated public RTR servers instead. The main reason is that I don't want my routers to depend on the reachability of infrastructure that I operate myself. I'd rather have RTR connectivity provided by infrastructure that is operationally independent of my own network. Does anyone know of operators that intentionally provide public RTR servers suitable for production use? Thank you, Stefan