Apart from the fact we shouldn't bring them any traction, I'm not sure if that's the best way to advertise Lemmy. I mean, I think a big percentage of redditors have already heard of the threadiverse and they still choose to stay on Reddit for whatever reason. So a plain "join Lemmy" sign would probably seem like another annoying ad to them.
I think the best way to advertise the threadiverse is by sharing the content that's being created here and actually explaining/showing why it's a great platform to use. The more we do that and the more Reddit keeps pissing people off with their dumb updates and everything, the more people will end up checking the threadiverse out and hopefully joining it.
there are a handful of communities related to Reddit (which is fine imo), so I really don't get why some people post Reddit related posts in random/unrelated communities (like this one) and bother people who don't want to hear anything about it