I have seen people post online attitudes against using the Rav Kav system on public transportation due to their believing the real purpose of the rav kav is for the government to be able to keep track of our movements, via the rav kav - they will somehow have access to seeing what buses and trains you are taking to go places and will know where you are.

The government must lead pretty boring lives to get excited about tracking my movements.

Those calls are generally on individuals to not use the rav kav, rather to pay with cash or use an anonymous card that is not customized to the rider, even though that means the specific rider will generally pay more.

That conspiracy theory has just escalated.

According to Kol Milchama, some sort of headquarters for distributing information in the fight against the IDF draft, the rav kav information is now available to government offices and the Ministry of Education gets reports in real time of students who should be in school or yeshiva but are in transit to other places. They also add to make sure not to buy things using your credit card, as that is also tracked.

Even more interestingly, they advise people who need to go somewhere by public transportation but not wanting to be noticed by the government - if you must use a rav kav with a deal on it (ie not an anonymous rav kav), you should use someone else's rav kav, like your father's or brother's rav kav.
source: Kol Hazman

Note: they do not say it, but using someone else's rav kav is against the rules. Putting their money where their mouth is they should be honest and say that one can use an anonymous card and pay full price. That is the price you pay for anonymity.