Minister of Internal Security Gilad Erdan has made an executive decision that Hamas members in Israeli jails will not be allowed to watch the upcoming World Cup competition in jail. He is also looking into the legal options for changing the current rules in order to be able to prevent security prisoners from watching specific shows or channels.

Erdan's goal is to increase the pressure on Hamas to release the bodies of Israeli soldiers (Hadar Goldin and Oron Shaul) they are holding in captivity, along with Avra Menegistu and Hisham A Sayid that were abducted by Hamas.
source: Srugim

I wait to see if watching a soccer game is so much more powerful than political and financial pressures and can get the job done where those could not.

In general, if the reports as to what freedoms they have in jail are true, while it is still difficult to compare a prison stay to summer camp (as their freedoms are often described as such), they do seem to have too many freedoms in prison and making their stay a bit more difficult could make the threat of prison more of a real threat.