It’s about making it more difficult to get access to download all of Twitter for use in training AI. chatGPT was trained using Twitter and Reddit. And large language models like chatGPT are HUGE money makers and have insane potential. The AI industry is exploding right now, so Twitter, Reddit, and others are adjusting how you can access their content so they can charge big companies money for the right to use their data.
If two of the same topic is posted, the one in the instance with more people will be higher on the active list than the other, so if you’re subbed to both, you’ll see that one first and interact with it. I’ve seen duplicate topics across several of my subs on Reddit regularly.