1. Jehovah's witnesses tend not to shoot up synagogues, whereas an otherwise typical member of Gab did.
2. Antisemitism isn't a protected class.
I can see from your comments that you are one of those, "I'd defend to the death your right to say it," people. I must admit, I would not defend to the death someone's right to spew hate toward Jews. That's not my hill to die on. I rather feel . . . the opposite. I'm glad that Gab got kicked off GoDaddy, and if I had my way, they'd be relegated to the dark corners of Tor.