I consider Monero useful but most of its users are unethical. It's pretty telling that the author of the blog post bashes it in the exact way you should. "Don't buy it" as if it was meant to be speculated with.

Wasn’t Bitcoin painted in a similar light before it became mainstream? Monero’s users being unethical (in your opinion) is a testament to the usefulness of the technology, not the other way around. Would you say the same thing about Tor?

All the claims of Bitcoin being anonymous were either incredibly misguided or delusional. Bitcoin is arguably far less anonymous than even cash, as it creates a permanent record of transactions. If your account is ever de-anonymized, and there are good techniques to do that, then any transaction you’ve ever sent ever is going to be visible. The only privacy benefit Bitcoin has over cash is that it’s easier to transmit it remotely, which eliminates in person risk.

Monero is at least designed to be anonymous. It’s possible that some flaw or mistake will eventually be uncovered that will break its privacy, but the underlying structure is better.

i would replace unethical with illegal and that would be right.