This is a Growth Hack for them but this was very frustrating for me to know and especially they don't have any authority over my WhatsApp Status.
When I did some reverse engineering, I found SideKick is adding an extension that injects content script on web.whatsapp.com and it changes the WhatsApp status automatically every 3 days or so and then they also send the analytics events to their servers.
They may/may not be doing anything with my data but the bigger question is when people over Internet are using browsers like these, they get full access to what you browse and everything else like Cookies, Passwords, etc.
Even they can stitch your sessions in Incognito if they want in the backend \_(~_~)_/. Who knows.
Browser extensions are still vetted by respective vendors like Google & Mozilla but how do we ensure we are browsing the Internet safely?