No evidence that they sell your data against their privacy policy has ever come to light, so I think you should probably back that claim with evidence if you think otherwise.
To play devils advocate (i know nothing about discords use of data), isnt it trivial for any corporate counsel make legal statements like this that are not truthful? For example: we dont sell your data... we freely give it to our sister company with a common owner that sells your data.
That’s illegal under CCPA so if they did that to the data any California resident they would be in big trouble. More or less any transfer of data for which the company receives some benefit counts as a “sale” under CCPA.
That's not true at all. I worked with Palantir on a project for a prior company and they'd basically do whatever you wanted if you paid them. They had a very heavy data / "AI" presence and this was years ago. They certainly do not just do integrations.