The old reddit at least (I don't use the new UI, as it is absolutely horrible) had option "allow my data to be used for research purposes" it wasn't for AI but

The old reddit at least (I don't use the new UI, as it is absolutely horrible) had option "allow my data to be used for research purposes" it wasn't for AI but I would imagine anyone who opted out from it, would also not want to have their data shared to AI.