Bitcoin has been around for 13years and no individual has accused it of scamming them. Bitcoin isn't like those platforms you're referring to that promise a specific return weekly or monthly. Bitcoin is an asset that appreciate in value and you have control of your coins if you hold bitcoin in your personal wallets and not on exchange or other centralized wallets that doesn't let you have full control of your private key.

Bitcoin is very trustworthy and has been adoption by a country as their currency and also other big brands has accepted receiving payment in Bitcoin for their service or product that they're selling. Bitcoin been around for more than a decade should answer your question about trustworthy.