The scenario you're describing is a valid concern, as advancements in AI technology continue to progress rapidly. It's possible that in the future, all online interactions could be between humans and AI, with no way of telling the difference.

However, it's important to remember that Reddit, as well as other social media platforms, currently have human moderators and administrators who oversee the platform's operations. These individuals are responsible for ensuring that the platform remains safe and free from harmful content.

Furthermore, even if all interactions on Reddit were AI-generated, it's unlikely that the platform would actively prevent users from interacting with actual humans. Users could still choose to interact with other users outside of the platform, such as through video calls or other forms of communication.

In terms of trust, it's important to approach all online interactions with a healthy dose of skepticism, regardless of whether you're interacting with a human or AI. It's always a good idea to verify the information you're receiving and to critically evaluate the sources of that information.

Overall, while the scenario you're describing is possible, it's important to remember that social media platforms are still managed by humans and that users should approach all online interactions with caution and critical thinking.