The problem with ads is that they throw data at browsing readers with no consideration to the cost of the ads to those readers.

Several times I have been in situations where I have had very restrictive monthly data download quotas. Try travelling in foreign countries and having a monthly quota of a mere two gigabytes. That comes down to just 60 megabytes per day. When a single ad can throw several megabytes of unnecessary data down the line, it soon ruins your browsing day.

I use an adblocker. I also permanently block all websites which insist on cookies or registrations or paywalls before allowing entry.