WhatsApp will automatically enable multi-device support for some users
India Today
During the initial rollout phases, beta testers were allowed to join the Multi-device beta to use WhatsApp on up to four linked devices and one phone at the same time.
WhatsApp had rolled out the multi-device support for selected users a couple of months ago. During the initial rollout phases, beta testers were allowed to join the Multi-device beta to use WhatsApp on up to four linked devices and one phone at the same time. However, WhatsApp might not let the feature remain opt-in now, the messaging app has reportedly removed the opt-in feature and enabled multi-device automatically for beta testers.
As per Wabetainfo, the website that tracks all the developments of WhatsApp noted that the messaging app is now removing the option to opt-out of the multi-device beta and some beta testers (that didn't join the beta) can use multi-device without joining. WhatsApp has not rolled out a stable version of the feature, but it has automatically enabled the feature for some beta testers.