It is always work even if it’s a passion project.
People used to make shitty websites with good content but now they need to make good, professional looking websites for people to even look at them to decide on the whether the content was good.
This takes time and if you’re doing it for free then you’re choosing to do extra work on top of your day job.
As others have said, there are costs to hosting a website other than the time that you’re expecting people to give for free.
It’s already a pretty common feature. My car has a speed limit sign reader and flashes a warning on the screen when you reach the speed limit.
It also has a button to set the car’s speed limiter to the detected speed limit.
It gets it wrong quite frequently though. Sometimes it misses signs and other times it picks up a sign on a side road that goes ahead where the road that you are on turns. I don’t know how it decides to handle national speed limit signs - sometimes it shows a national speed limit sign on the dash but other times it shows 60 or 70 instead.