If you end your Ghostery Contributor Donations, you will no longer be charged. You will, however, continue to have access to features until your Contributor time runs out (time remaining before you would have donated again). During this period, you may restart donating to resume your Ghostery Contributor status and donations as usual.
If you would like to donate again after your time runs out, you must go through the Ghostery Contributor process again and reenter payment information to restart donations.