There will always be bots on the Internet. I do not believe this is a solvable problem. Instead, we focus on mitigation.
However, Reddit has little incentive to fight the bots because it increases engagement metrics. In fact, it costs money and reduces profits to reduce bot activity. Hence, so many bots.
Right here on Lemmy, because nobody financially benefits from turning a blind eye to the problem, I think we have a head start. This platform is created by users for users. For that reason, I think we should never have the problem quite to the same extent as they do.