@special NetFree uses a software called WiFree to lock the computer from removing the filter. the removal of WiFree costs 100 NIS (approx 27.41 USD) if this software is not installed on your computer then your computer is not protected if the filter gets dissconnected.
the software can be found here: https://netfree.link/wifree
more information: https://netfree.link/wiki/WiFree_Software
NetFree support: https://netfree.link/user#/tickets/list or +1(562)-332-6000