I’d guess it’s the cheapest way for your employer to downsize, though it’s a pretty crappy way to treat people. Either that or it’s a way for another contractor/agency to look busy and avoid their own downsizing.
I kinda question bankruptcy/foreclosure as reasons to pull someone’s clearance. I’d guess that someone trying to avoid bankruptcy or foreclosure would be more vulnerable/susceptible to blackmail or bribery, in the same way that an openly gay person would be a better security risk than someone who resorts to secret assignations in park restrooms.