> no official export tools.

There actually is technically an official method to request a copy of your own data (think Google Takeout): https://support.discord.com/hc/en-us/articles/360004027692-R...

I've used it once. It worked to recover some messages from DMs that were far enough down in my history they were no longer shown in the web/desktop UI. However, it only included my own messages in each DM/channel, without the context of whoever I was talking to.