https://github.com/bitcoin-dot-org/bitcoin.org/pull/1181
From the letter that they signed, Bitpay, Circle, Xapo, and Bitgo are supporting Bitcoin XT. As stated in the letter,
We[the signers] support the implementation of BIP101
The only implementation of BIP101 is BItcoin XT, and they are also promising to
support BIP101 in [their] software and systems by December 2015
December 2015 is almost gone, and they have already promised to upgrade to XT.
Since Coinbase was already removed for supporting Bitcoin XT, then these other wallets should be removed since they also support Bitcoin XT, as seen by the letter they all signed.
BTW, Copay is Bitpay's wallet.
achow101 added some commits on 28 Dec 2015
@achow101 Remove copay
@achow101 Remove circle
@achow101 Remove xapo
@achow101 Remove bitgo
and when segwit was getting ready to start needing support... suddenly the politics ramped up and suddenly the segwit supporting entities popped up again