That’s for you to decide. Its properties aren’t hidden. You get the rules handed to you upfront and the rules are always adhered to - BTC inflation will always be what the whitepaper describes.
Think of it like poker. People lose money playing poker too. Is poker a scam? Nope. You might call it unethical or gambling, but unless a player is cheating, its not a scam. And any participant willingly agreed to the rules before playing.
Same with BTC. If you bought BTC, you willingly agreed to the rules. If you didn’t “win”, that’s on you, not the “game” itself.