I saw this approach used by one of the community-based "AI" tools (I don't think I can mention the name here so I won't) which uses ad revenue to allow it AI tool to be free to use, I think it is an interesting approach since this would make this self sustain just by having internet use it. So long that it doesn't intrusive and only for people who can't pay due to reason.

it's incredibly unlikely that we'll turn Botpress into a farm for ad revenue - the product is valuable enough without it