Lack of Official Features: Pirated versions generally cannot access Battle.net. This means you lose out on the ladder system, secure online multiplayer, and the "Shared Stash" synchronization across different platforms.
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Malware and Ransomware: RAR files from unofficial sources are common delivery methods for trojans. Because the contents are compressed and often password-protected, many antivirus programs cannot scan them until they are extracted, at which point your system may already be compromised. Lack of Official Features: Pirated versions generally cannot