#noindex would take precedence over #nobot and likewise for #yesindex.

@Maholmire ...the sequence will also matter: if in the same bio a #noindex followed a #yesindex, #noindex would occur.

@Maholmire ok, so to summarize... #nobot will be treated as a generic catch-all, preventing the crawler from indexing the profile and making it delete it if it was previously indexed (people change their minds); #yesindex will be treated as a generic "i'm ok with any indexing"; and there will be a very special #noindexbutmasthelp that will be treated accordingly :))

@Maholmire well to my knowledge those you cited are only front-ends (Soapbox front-end, Mastodon front-end and Bloat front-end) and Stereophonic is definitely Pleroma, anyway as i wrote before i'll make the crawler honor #nobot as it was #noindex, and still give users the possibility to say "i'm ok with search engine indexing, not with other bots", making it honor a possible #yesindex tag in any case :)
I also think Pleroma is better than Mastodon when it comes to this topic: it has an "Allow discovery of this account in search results and other services" setting which is opt-in, and is not active by default.

@Maholmire in the end, i think i'll make it honor #nobot as it was #noindex, and to still give users the possibility to say "i'm ok with search engine indexing, not with other bots", i'll make it honor a #yesindex in any case :))