They should not get a single satoshi from the ICO funds until delivering what was promised.
Are you being paid for promises? Yes/No?
devs promised launch when it launched. they did not promise the full features to be available on the launch.
all Ethereum software is still considered beta, should they give btc back?
They didn't...? Hmmm, where did you ready it? Where did they say the following features won't be delivered at launch?
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The key features WAVES will have at launch are:
-Custom token issuance, transfer, and decentralized trading
-FIAT tokens on WAVE blockchain
-Cryptocurrency tokens
-Community management features
-Plug-in system
Features after launch
-Reputation system
-Privacy features