We can repeat this countless times, but such things should be learned long before someone becomes interested in something like cryptocurrencies. The level of basic computer literacy even in some developed countries is very low, let alone the rest of the world - sometimes it seems to me that AdBlock is something hidden, difficult to access or has to be paid to be used given how much internet users use this add-on.

uBlock Origin for Firefox has only 4 413 022 users which may maybe a good number, though it seems to me to be very small compared to all those who use that browser.