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if the testing sites are indeed doing it then they are likely more efficient about it, trying to make money from selling the data they gather. Worst thing about them is they are completely unnecessary and pointless even if they were trying to help users with blockers. There is no point in testing your adblocker, just go to the sites you usually go and if you see ads then it doesnt work properly.
also those who dont want to install that spyware shit on their phones. Even if you dont care about the data collection it still consumes battery faster as more and more data is being transferred