That's when you're lucky. If you're unlucky it's malware injected via ad networks.
Browsing the web without an adblocker is like sex with multiple partners every day without a condom.
Its more like being a paramedic/EMT and not being allowed to wear gloves on call at blood covered scenes. Well I'm sorry that corporate policy won't let you wear gloves anymore but "we have to" keep profits up for the hepatitis and HIV treatment drug industries so you'll just have to deal with it.
A standard HN automotive analogy would be working as a car mechanic while not being allowed to wear safety gear.