How do you monetize Bubble app?

Could you please elaborate on the process of monetizing a Bubble app? I'm particularly interested in understanding the various strategies and methods that can be employed to generate revenue from such an application. Could you provide some examples of successful monetization techniques? Also, could you discuss any challenges or limitations that might be encountered when attempting to monetize a Bubble app? It would be great if you could share your insights on how to optimize the monetization process and maximize revenue potential. Thank you for your time and assistance in this matter.