You're partially correct with some of these points.
Theatge amount of energy you mention is really only relevant to proof of work. You've mentioned proof of stake etc - so you should know that. The energy requirements for "proof" techniques such as PoS is negligible
Reversing transactions are 'hard'/infesable - and so in a way they do help scammers - but I think it's a false equivalence. It helps everyone. In my mind it's like says "encryption helps terrorists", that may be true, but it helps us all.
Regarding on chain transaction transparency, there are some chains that are like this (bitcoin), and there are some chains that are not (monero). There's also ways to anonymise transactions through mixers etc if you do care about that. Although, I don't know of anyone that gets their salary into their crypto wallet.
Overall, regulation is slow! But it's getting there. I don't think crpyto will solve all of.humans problems, but I might just help with some. It's going to be interesting seeing how it all plays out - people thought it was going to be here and gone in a year, but it's been over a decade now.
TradFi has a few wealthy individuals that control banking
You say PoS is an oligarchy, but it still offers anyone to participate in markets they previously were unable to. For example, providing liquidity and getting a cut of transaction fees - this is something TradFi has a monopoly on, but now everyday people can get a cut. You're right that people with more money will have a bigger cut - but it's still more equal than TradFi