It is strange for me. Sometimes I don't see any spam and then other threads are full of it.

They now look like real well know npubs but post random unrelated comments.

Example of spam account: nostr:nprofile1qqsfg7gwd9t3aly8nzwd0ldcsrcrn5n5wg3fwjn03chut9wdl453mhgpzpmhxue69uhkummnw3ezumt0d5hsnwf0e8 or nostr:nprofile1qqs8srv5yd47pxmy749k9rqzcnesnut298mwkn5cfs6zggxjs7ty9eqpzamhxue69uhhyetvv9ujumn0wd68ytnzv9hxgtcr0yq7w

I see them posting on wss://relay.damus.io/ and wss://nostr.oxtr.dev/