This topic is about p2pool. P2pool is related to multiple currencies, but it is primarily about Bitcoin. As such, I do not think that this topic violates that rule. Note that the rule says "topic", not "post". My reading of the rule is that a post about an altcoin is permitted in this forum if it is relevant to the topic of the thread, and the topic is mostly about Bitcoin Mining.
P2pool has supported mining Litecoin as well as Bitcoin from the same codebase
since 2012. Choosing to start forbidding altcoin posts after 6 years of allowing them is extremely disruptive. If you insist on forbidding them now, we will need to find another forum.
Altcoin P2Pool has grown in significance and popularity relative to Bitcoin P2Pool over the past year, and it will continue to grow in significance as altcoins continue to grow in popularity, adoption, and market capitalization. Such significance, visibility, and popularity were not present before the cryptocurrency boom last year. Recent posts in this thread have hinted at this, as a growing proportion of these posts have been primarily about Litecoin and/or Bitcoin Cash, especially since after you released your jtoomimnet Litecoin and Bitcoin Cash P2Pool forks. So no, this topic has ceased to be mostly about Bitcoin mining.
Also, P2Pool did not support Bitcoin Cash until you released your BCH P2Pool fork.
It would therefore be more prudent and more beneficial to have discussions regarding altcoin P2Pool moved to the altcoin board, which is the proper place for such discussions and where such discussions are allowed to be more focused and more thorough. It would also allow this current thread to be more focused and more thorough when discussing the various aspects of Bitcoin P2Pool.
I understand that the underlying codebase may have far-reaching similarities between the different coins that P2Pool supports. In such cases where a post would cover both Bitcoin and altcoins, it would then be simply a case of posting in both threads, with links and/or quotes to/from each thread if necessary, and then distilling further discussions from that point on into their respective threads. It would be like how -ck deals with his ckpool.org and solo.ckpool.org threads.
Also, I'm not forbidding altcoin posts, but merely insisting on having them in the proper designated area.