That's interesting, I never faced any issues with Blockchain.com, but that belongs to the past, since a lot of things have changed since then. Although, we can't be 100% sure about the legitimacy of these reviews, let me elaborate. Blockchain.com does provide you with your private keys and the seed phrase, at least they used in the past, how can someone block your wallet if you actually have your keys, can't you import them into Electrum for instance?