Well this are the reasons
Colombia is a very biodiverse country and has many many birds species(macaws,amazons,conures ect) and there is a lot of wildlife trafiking,you can basiclly go to the jungle and get a macaw. This practice is very common so the goverment prohibited people to own this animals because they were going extinct. Also people are not very informed here so they prohibited to have parrots that came from other countries thinking they were Colombian though they are not(african greys,ecletus,cockatoos) but lovebirds,cockatiels and budgies have been breed for a long time in Colombia so they are legal. It is very sad you can not own a parrot like that because if it was legal to breed them people could buy them from a store and the ones in the wild would not go extinct because people dont have the need to go and capture them.