Unlike so many people here, I think discord not being indexed by search engine is pretty OK and is even a feature. All other spaces of internet have been invaded by bots, astroturfing, sucking every single bit of data possible... The more the data is easily scrapable, the more it enshittifies everything around it. Moreover people don't behave the same knowing that something is private vs something is public (yes things are mostly public on discord, but at least there's a sense that someone has to actively look for your messages instead of having them indexed by default)