Looks, like I might be wrong. I thought I remembered it from this article
https://cadence.moe/blog/2020-06-06-why-you-shouldnt-trust-discord#business-model
but, while it says, that your data will probably be sold, it seems like the second part I remembered came from somewhere else, so might not be reputable. Maybe I'll later do some more research, but it took me a while already to find this blogpost again, since it's been a while, since I've read it.