This shouldn't be for cats only, but a general OSS GPS tracker for vehicles too (I know it can be used for that), lots of people from home-assistant community will be interested in it.
But vehicles don't need the indoor tracking, or the home base station, and when moving have nigh-unlimited battery power available.
So I imagine it depends on how much those features are adding to the price. Also, it looks like the device isn't commercially available, and with BGAs etc it's not easy to DIY either.
The cost of the device is less than $100, excluding the cellular data cost.