In terms of privacy reddit has it better(still bad but better than Lemmy) because your content is locked behind a paywall only few companies can access. On the other hand, any one can train their AI on Lemmy posts and access all history of all users freely. The difference is that on lemmy only the companies that collect your data profit, while on reddit also the owners of the platform (reddit itself) profit.
In terms of privacy reddit has it better(still bad but better than Lemmy) because your content is locked behind a paywall only few companies can access. On the other hand, any one can train their AI on Lemmy posts and access all history of all users freely. The difference is that on lemmy only the companies that collect your data profit, while on reddit also the owners of the platform (reddit itself) profit.