They can ban VPNs and Tor because it's affordable. Most of their users aren't using VPNs or Tor. Get enough people to use VPNs and Tor and they'll suddenly become unable to drop the traffic.

The ideal world is one where everyone is using Tor. They can only discriminate against you if you're different from others. The idea behind Tor is to make everyone look like the same user. The anonymity set must be maximized for that to work.

thank you. that is a really good point. the economic incentive! i will keep using mine!