will you have more confidence for other projects who invested by private institutional investors?
Maybe most people will say YES, but it's against the spirit of blockchain
When you mean the spirit of blockchain I want to believe you are referring to the decentralization and as it relates to project, I would say its really not bad as it seems because if managed very well, it can be combined with crowdsale in other to dilute ownership in that way, the 'spirit' of blockchain can still be protected. To set up a project involves a lot of funds just for mobilizing, designing website, drafting legal documents, cost of internet, attending events, press conference and all of those even to the point of forming a team. It might be too much for individual or group of individual to afford depending on their finances couple with the downward trend in investments in to pre-ICO activities.
With all of this put together, if an institutional investor could come up with the seed money to make the journey seamless and stress-free, I don't think there is anything wrong in going that route to ensure the set objective is met.