Yeah. This is a great idea. The greeter bot you mention is very similar to the https://community.brave.com Hive account@discobot. That walks you through posting and markup:

And those on slack.

If your not using Brave's browser check it out. Its great.

It's a cool idea to merge the greeting bot as a real life persona like Tom but AI bot...... Like everybody is following that one person when they join. How about a Satoshi bot with some picture of a real person that is obviously not Satoshi but everyone in the future will associate him with this pic. Like Tom.