Same here - lacking that, some information on how it is hosted and what you plan to do with it (monthly subscription? Collecting the data for research?) would be nice before having to hand over an email address.
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.