You should have read everything right! My suggestion was not to play with gifts.
Only that is contradictory to what you do with boosters you get for free.
Then you should not accept any boosters !!!
Unfortunately I have with you the feeling that you are a child !!!
if people can give you boosters, they will deplete their stock. So, it won't work... What would are the stupid virtual gifts you find on some sites, and that is really silly. I cannot think Activision would let people send boosters if you don't own them.