Most activators require you to disable your Antivirus or Windows Defender before running them. This leaves your system completely exposed to Trojans, ransomware, and miners that are often bundled with the activator file.
One of its main draws is the ability to activate software without needing a constant internet connection, using KMS (Key Management Service) emulation locally.
While the prospect of "free" software is tempting, using tools like Reloader Activator 3.0 comes with substantial dangers: