they’re using are going to be flooded with mirrored Reddit
Only if someone set this up to mirror some large subreddit, which would be frankly stupid: the service still requires a reddit API key and they would quickly go over the limits of the free tier if they pulled data from the larger subs, also instances that would be flooding other communities would quickly be banned.
This is why I am being very careful about setting this up. I am not going to set these bots to any community unless I get explicit approval from the admins and mods, and I am not going to create mirrors from any subreddit with more than 250k subscribers.