reddit is telling it's future investors with recent news and more info on their IPO, that they're currently selling and looking to sell their user's data to companies wanting to train their LLMs, including Google....
It depends on where you live. But reddits EU offices are in the Netherlands, so you could file a complaint with them. Usually it should be as simple as searching for "gdpr supervisory agency [my state/country]" to find their website and complaint form.
I actually live in Australia but I am still a EU citizen. The only issue is I made the account whilst in Australia but that shouldn’t be an issue I think.