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[Abi79]

Another explanation:

Originally posted by www.theesa.com
The primary objective of ESA's Anti-Piracy Program is to attack and reduce global entertainment software piracy, estimated to cost the U.S. entertainment software industry billions of dollars every year.

Game producers are paying ESA to close the sites hosting their games, so that people will buy the games from them and not download them for free. Abandonia doesn't host ESA protected games 'cause it may get closed. We wouldn't want this to happen, no ?