I plan to continue to offer it for free, as the costs are so minimal and I want to use this service myself anyway.
Eventually, I may offer very minimal text-based links to Amazon and other stores for relevant lightbulbs, batteries, etc. (when you click on a "thing" in your house), and those affiliate fees would be more than enough to cover my hosting costs. I want to be clear, those links would be something like "Find a replacement lightbulb on Amazon". That's it.
There is no intention of making this project a unicorn.