I do not know very well what restrictions on concurrent access They could, or may well not, have imposed on their own service, but this seems likely to be something that is their doing (one way or another). This thread has become closed via the process or even the community https://whatsapp58912.madmouseblog.com/16199936/how-much-you-need-to-expect-you-ll-pay-for-a-good-whatsapp-web