Your warning is right , WPS is not safe, but i don't see much connection between WPS and crypto. Even if someone connect to your wifi, your crypto are still safe , right? Hacker still need to hack the cellphone to stole from a hot wallet.
Your crypto becomes less safe, because the attacker can send malicious files to you or hijack your connection (though this is not a easy job too). They can also edit your network connectivity and they can add something like malicious website that needs to be opened if you want to use your connectivity. So I guess people need to be reminded that exposing your connection is also dangerous, even if you don't lose any crypto, they can attack you in another way.