If it can be used on one random person then it can be used on the hundreds of millions of random persons who use iPhone and Android.

And getting even 1% of those massive user bases to click on a link and steal their money or private information, would be incredibly lucrative even for the short period until the patch rolls out, especially for the wealthier iOS userbase as a target.

In my EU country, I'm still getting regular spam SMS with links to what I presume is some older Android malware that wrecked havock last year. So, if attackers are still at it, months after a patch was rolled out, it means they must be still getting returns on their "investment".