@matigo Unfortunately muting the WhatsApp group as well could also mean missing genuinely important messages.
It's a shame when people abuse group chats.
The problem, as I see it, is that rather than working to reduce the overall number of automated notifications (i.e. not a manually typed message that says "I just sent you an email") such that each notification is actually looked at, many people conclude that those notifications are background noise and find other ways to send even more notifications.
Which strongly suggests that the only suitable industry for them is advertising.