They are used to bypass paid licenses, which violates software copyright laws and Movavi's terms of service. Using them can expose you to malware, legal liability, and lack of support/updates.
If cost is a concern, Movavi often offers discounts, free trials (with watermark), or you could consider free/open-source alternatives like or Shotcut .
Movavi provides discounts for students, educators, and non-profit organizations, which can make the software more accessible.