I was listening to a Darknet Diaries episode where Maxie Reynolds seems to make it work: https://subseacloud.com/ I don't know how profitable they are, and I doubt this is scalable enough, but it can work as a business.
That, or to prevent the tracker in more expensive cars from doing their job.
In mainland Europe, some high end cars need to be fitted with a GPS tracker for insurance. Thieves will try to jam GPS to those trackers until they're: A) figured out how to disable/remove it, B) fled the country.