Malicious advertisements on major websites lead to ransomware

As long as they don't develop a secure system for advertisement on internet, adblockers are indispensable, no matter how much internet companies complain. I feel sad when blocking ads on sites of people that I know and appreciate but I won't lower my guard. Adblock plus has kept me away of at least two of those incidents during the last year, maybe more, you never know. One was related to Yahoo, the other to a videos site.