Yes, definitely POB is earning money from crypto advertising network and that too in Bitcoin. But its actual use is still not shared anywhere in community I guess, see more details in this post by Hive account@proofofbrainio. He asked for suggestions of community in this post on how to use advertising funds. I think they are used for maintenance of POB Site. And it's completely OK because that optimal too.
We already have Hive account@pob-fund, Official Account for Funding POB Development with more than 18K POB in its wallet for further POB developments and seriously its High time We needed to use the fund for new projects and development.
How about POB have its own DeFi Platform just like CUB Finance. Or We could have a POB Blockchain Game that could use POBs and pay dividends in Hive or other Token. We seriously need more use case of POB, because simply buying and selling of POBs is not good in long-term. Its time to act now. 😊🙏