OpenAI introduced Custom GPTs in OpenAI's words: "

You can now create custom versions of ChatGPT that combine instructions, extra knowledge, and any combination of skills."

In the screenshot above, OpenAI states that a store is expected to be launched soon and that they will also be sharing revenue with Custom GPTs based on "how many people are using your GPT". People have been speculating on Twitter that a possible revenue sharing model could look something like this:

Will resolve based on available evidence. Custom Bots by OpenAI won’t count. If the bot generates revenue through referral links or direct sales it won’t count. Only revenue paid out by OpenAI for the usage will be counted.