The real problem is the popup ads they serve. Actually, it's not their fault, it's the advertisers.
Why do you even care? Well, earlier today, I ran into a redirection to a site hosting an 'Adobe Flash ''Update'' on desktop and a fake Google virus alert on mobile .[iOS]
That's not to say that ALL ads served on NM are bad.
You might want to add these sites to your Adblocker if you are on desktop: ||motosal.net usr.dropkickmedia.com ouslayer.co
If on mobile or just wish to play it safe: ||mobileofferplace.site
This is one reason we just don't have ads. More trouble than they are worth, especially for the kinds of third-party ads you'd be able to put on here (FA trialled them for a short time, and quickly saw a user backlash which forced them off again).
This is one reason we just don't have ads. More trouble than they are worth, especially for the kind