No, we know very little about how these bridges operate, or any kind of "dashboard" information like that. nostr:nprofile1qydhwumn8ghj7emvv4shxmmwv96x7u3wv3jhvtmjv4kxz7gpzamhxue69uhhyetvv9ujuurjd9kkzmpwdejhgtcpzemhxue69uhhyetvv9ujuerfw36x7tnsw43z7qgkwaehxw309aex2mrp0yhx6mmnw3ezuur4vghsqgqyv87tanzvxd6y8xfj66u0zynfendhejtn44a9pt3k9kcntfr5m5c5utfg operates Mostr but doesn't really respond to comments about it, except occasionally to cuss me out... The nostr:nprofile1qy2hwumn8ghj7un9d3shjtnyv9kh2uewd9hj7qgewaehxw309aex2mrp0yh8xmn0wf6zuum0vd5kzmp0qyt8wumn8ghj7un9d3shjtnddaehgu3wwp6kytcppemhxue69uhkummn9ekx7mp0qythwumn8ghj7un9d3shjtnswf5k6ctv9ehx2ap0qqsxhcu0333a7ldlsndha39xumammrgemj3mnq8045v9shzx7p9jd7gz4dcxl npub hasn't had an update since 2024...

And whomever is responsible for "momostr" has intentionally not disclosed their npub.

To respond to the 2nd point about content... I've personally not had that experience, I follow a bunch of Mastodon npubs that post content I want to see, like nostr:nprofile1qyvhwumn8ghj7un9d3shjtnddakk7um5wgh8q6twdvhsqgxqexcr5rkwztv2lxhqachh5vxg6hh4eqcacar0nrxm934gpypzvqxy3xgs for instance