Or maybe you can do both, that's the reason behind the tool I'm building right now: https://www.channelsync.chat/ In this way you can mitigate #1 "the memory hole" and also the #2 "Google can’t see inside chats" while creating a mirrored forum version of the best content you have on Discord.

It's still in closed alpha right now. But I would love to know what you think about it.