CS experts come

The other day I was watching tenz where he opened CS2 cases, the fans gifted him a lot of cases. He still said he spent 1500 bucks?

Are cases free or paid?

idk what your question is but yeah you have to buy cases along with the keys to open them

you can get cases for free by playing too

Getting cases can be free as a reward, mostly bought. Opening a case is never free. Cases give you the opportunity to spend money and gamble, not much else.

Cases can be bought from Steam marketplace (people can get these free as drops after games or at least could)
Keys have to be bought from CS own market.

You need both to open a case. Keys always cost the same pretty much, while case price depends on their marketplace value so usually older cases cost more money as there's less of them or cases that have good skins in them etc.

gifting your cases to tenz is crazy ngl

Case prices are fluctuating it depends on product in the case and the market value which decides the value of it, they can also be gifted
but u need keys which are almost same in price and ain't tradable like cases they can not be directly gifted but u can still gift them by giving steam gift cards

Get free cases from playing stack up those cases and sell them in the market free money