Regarding SEO, What’s stopping maintainers from vandalizing their own fandom page?
It would not be difficult to make a bot to update fandom page with a convincing but slightly wrong info, after a few hundred iterations, it’s all useless. Go look at what google recommend and do complete opposite. I’m convinced this will bomb ranking and put whatever wiki they migrated to at the top.
The disinformation doesn’t really matter. The fandom wiki’s naturally become incorrect over time, since they’re typically no longer maintained after a community switches, so vandalizing it after the fact won’t really change anything. For Path of Exile, it took the developers linking to the new wiki, and about two years of the community sending new players to the correct wiki, before it even started to show up in searches. Even then, I believe the fandom wiki still shows up first if you look at some of the very old entries.
Misinformation may reduce repeat visit, that part, I have no idea if google take into account when they rank the result. Domain/page age also plays a role. But what about other “problems”? If I try to de-optimize every items on that guide, will it speed up the de-rank as well?