Now that outbox is getting to be widespread amongst clients I think relays filtering is less of a problem. It's not just a few main relays anymore, there are thousands, and you don't need common relays to pass notes. Anyone with a minimum of hardware and technical knowledge can run one, for just themselves, or for a community.
This is incomplete, but still relevant. I know nostr:nprofile1qqsdfx5syw3pmwsm8jpsdj3kn0ejg0vtgju0pdk3r9nq0aasny863hcpr9mhxue69uhhyetvv9ujumn0wdnxcctjv5hxxmmd9uq35amnwvaz7tmnv4hxg6t59ehx7umxd3shyefwvdhk6tce90cwc has an option using CloudFlare I should add.
Anyone truly concerned with moderation by other people should be running their own relay. Otherwise they're just LARPing.