The data is seemingly being used by hedge funds or firms that do targeted advertising and by government organizations like the Centers for Disease Control and Prevention and the U.S. Department of Defense.
X-Mode has been found in the past to sell location data from Muslim prayers apps to U.S. government contractors. Cuebiq sold location data to news organizations like The New York Times and NBC News during the beginning of the pandemic as they were eager to learn about the new movement patterns of the public during the early lockdown period.
Life360, which began selling data in 2016, instituted a policy barring the sale of data for law enforcement purposes in 2020 and this also applies to customers who get data from it. Whether they are complying with this is not known.
Life360 does give an option to its app users to disable the sale of location data.