I want to add that when I left WhatsApp (~2y ago) I deleted my account. WhatsApp kept accepting messages on my behalf. People didn't know I wasn't getting their messages. I'm surprised I don't see this mentioned to the point I wonder if I did something wrong at the time.
In the end, I reopened a WhatsApp account recently because everyone is using WhatsApp in France and I couldn't stand breaking everyone's efforts to bring us together during lockdown.