Honestly, the term decentralized is being used and abused by many project developers. They tend to mention that they're a decentralized project but lies behind that, they're not. Bitcoin is decentralized and that's what the meaning of it. And don't buy onto those projects that have been labelling themselves as a decentralized project. Another thing, DeFis are no longer a thing today.
What was originally decentralized then changed to centralized because of several changes made. Related to the ecosystem is the POW consensus Network change to POS and Bitcoin stays with POW and ETH changes from POW to POS.
Right, we have witnessed the change of PoW of Ethereum into PoS but even before that, ETH was actually semi-centralized as what they've said.
However, when it comes to exchange platforms, exchanges such as Binance, Coinbase, etc. are centralized, and there will be many obstacles and risks that could occur. Not your keys not your coins.
The majority of them are centralized honestly. There were even a few of them that have claimed that they were decentralized but also changed into centralized eventually.
and projects that claim they are decentralized must certainly prove it by the consensus network they use
Yup, when you're for the decentralized projects then you have to DYOR before investing on any of them. As I've said, many are just using the term as a buzz word to attract investors.