On the left, EA’s Patrick Söderlund talking to IGN. On the right, Corey Davis, design director at Psyonix (the developers of Rocket League).

All other reporting on this case mentions that the people who have contracted measles were either too young to get vaccinated or hadn't had all of the cycle yet. Assuming that it's due to anti-vaxxers is pure speculation on your part. Additionally, just because someone isn't vaccinated doesn't mean that they are…