Stash has become one of the most popular micro-investing apps in the United States with over 6 million users in 2021, according to the company’s website. Stash was last valued at $1.4 billion in 2021.

Call it the “stash house” tactic — a group of hardened criminals with tough backgrounds are invited to rob a location where dealers keep their drugs. They know it’s a good opportunity because robbing ...