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The entire point of cryptocurrency is to eliminate the need for trust. You can verify the source code of Ethereum implementations for yourself.

The only problem here is that they may have taken upon too much complexity, making it again hard to verify. It might still be better than closed systems with no option to appeal.

That would be a valid opinion (imo) - saying they failed to deliver. But accusing them of being scammers is off the mark.

The implementors of Ethereum are not the scammers. You can have scammers with every product. A salesman can sell you a used car that is broken. That doesn't imply cars are scams.

If somebody sells you Ethereum for 1 Million Dollars, they might be a scammer. That doesn't imply Ethereum is a scam.