Actually the people listed are using the Vuforia SDK licence incorrectly,
It specifically states under Section 2: Use Restrictions the distribution or disclosure of any source code - which github was doing - full extract here :https://developer.vuforia.com/legal/vuforia-30-license-agreement
You shall not incorporate, link, distribute or use any third party software or code in conjunction with (i) the Software (ii) any software, products, documentation, content or other materials developed using the Software, nor (iii) any derivative works that You make using the source code portions of the Software (if any), in such a way that: (a) creates, purports to create or has the potential to create, obligations with respect to the Software or other QCE software, including without limitation the distribution or disclosure of any source code; or (b) grants, purports to grant, or has the potential to grant to any third party any rights to or immunities under any intellectual property rights or proprietary rights of QCE or its affiliates, including without limitation as such rights exist in or relate to the Software. Without limiting the generality of the foregoing, You shall not incorporate, link, distribute or use (1) the Software or any other software provided by QCE, (2) any software, products, documentation, content or other materials developed using the Software, nor (3) any derivative works that You make using the source code portions of the Software (if any), with any code or software licensed under any version of the GNU General Public License (“GPL”), Affero General Public License (“AGPL”), Lesser General Public License (“LGPL”), European Union Public License (“EUPL”), Apple Public Source License (“APSL”), Common Development and Distribution License (“CDDL”), IBM Public License (“IPL”), Eclipse Public License (“EPL”), Mozilla Public License (“MPL”), or any other open source license,