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ICO and IDO is just the same, wwhitelisting is just to get attantion to people so the project can called them self legit. In fact ICO and IDO is the sameshit. IDO is not guarantee the project will succeed, ICO with strict KYC also still can give you good investment.
First, i thought, you might be right in words. But after reading all of those words, i'm sure that full research isn't done from yourside, mate. Just including a tweet where anyone see the success rate of all previous IDOs on polkstarter. Also, feel free to check those projects on CMC or CG to cross-check everything. So, better to check that out and kyc is also implemented on IDOs too.
Success rate of IDOs :
https://twitter.com/CryptoRank_io/status/1354119622312792065