I guess the most honest form of writing crypto advise would be to simply write what one does and what one invests in

I doubt if such writings would be honest.
And even if verified, such holdings can be created for the sake of advertisement itself, with some back door refunds/contracts.
For example I find it easy to believe that Trevonjb, Craig-Grant, CryptoNick and Carlos Matos had BTC vested in Bitconnect.

Am I sure they had? No, but I can easily believe it.

I also remember well when I first started reading about mining about eight months ago. Everyone said it was no longer profitable. I started Monero mining two months later, and as it turns out, it was indeed profitable. I don't think this kind of misinformation is always intentional. I think people in general have a tendency to spread information without researching whether it's true.

Good to know.
I thought that mining the older currencies was already past its profitability, but then while it is harder to mine a single Bitcoin, its price is also higher, and future price expectation may be taken into account.

I still believe that proof-of-work is bad, and had at least 1 thread about it less than a month ago.
I hope POW currencies will become rarer or become extinct in the future.