Because access to education should be free and available to every human being, no matter their residence or their income.
Building, upgrading and maintaining this free website takes a huge lot of time, effort, dedication and money, so some kind of monetization is absolutely needed if only to cover part of that amount.
As most of you know, this site was closed down for about one month due to lack of funding. The donations received at that moment to support the site made the reopening possible... for the time being.
Although I'm all against consumerism, I finally had to accept advertising as the only way to generate some income to pay for this site's bills, but sadly publicity is also far from paying for all the expenses, it's only some help.
So if you like this site, find it useful and don't want to see it closed again, please, support it with your donation and thousands of other users with a lower income will have a "thanks" for you. And me more than anyone else.
Thanks 
LEGAL DISCLAIMER: videos are not hosted on our server and we cannot hold copyright over our video transcriptions or, so your contribution would disregard those aspects of this website.
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