How hard is it really to fire someone, though? When I was recently a contractor the company was paying my contracting company well over double what they would'v

How hard is it really to fire someone, though? When I was recently a contractor the company was paying my contracting company well over double what they would've paid for me directly. They could've hired me directly and, if I didn't work out, fired me and given me a massive severance and it still would've been cheaper.