@silverpill I implemented that relay follow-back in October 2023 and triggered it a few times since then. Gets me 1% of the content compared to Mastodon client APIs.
Looking at the traffic, I get POSTs on that endpoint from a few manually-entered relays and from Mastodon and Friendica instances that use the buzzrelay. But these two send me every post many times for each of the hashtags they follow on https://relay.fedi.buzz. This spikey traffic amplification scares me and I want it resolved.