Every currency has its ups and downs. Even fiat money loses 50%. That doesn't make Ethereum scam. There are really big companies investing on ETH.
I don't believe that to be true.
Some companies are studying the ethereum protocol with a view to making their own tokens. The plan is to use their own, improved and no doubt proprietary, technology at some point in the future.
None that I know has expressed any intention of being associated in any way with the ETH token.
Edit:spelling