Contractors work given a CAPEX contract - a fixed budget. This means that new build software etc and fixed pieces of work associated can be put in as capex vs opex.
Permys on the other hand are OPEX for the majority.. but most organisations attempt to find ways for charging as capex depending on the task.
There are taxation and perceived uncontrolled risk implications between capex and opex hence the push to make everything a capex expenditure.
Yep. Usual tactic if a business is lining itself up for a sale, lose some permanent staff, reduce opex, pick up the slack with contractors. Seen this many times.