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Unfortunately the article doesn't answer the question. I was hoping for an investigation.

Whatsapp is #4 in battery usage on my phone, and has spent more time in background mode (9 minutes) than active (6 minutes.) Not nearly as bad as the author but I have to admit, I don't understand why it could spend anywhere near that much time doing anything. All it needs to do is be sent a new message.

It doesn't for my devices... Its quite efficient in my experience.
Is there a way to always force stop apps?

I got the same problems using Discord. It can take over 40% of a 4100mAh battery each day.

I have always assumed that WhatsApp just does a lot of things for Meta that aren't immediately obvious to the user.

For example, the app insists on downloading all the "status" pictures/videos that contacts post. I never open that part of the app, so I never see any of those media files. However, WhatsApp traffic stats inform me that it apparently consumed 1.4 GB of traffic to download 16,047 status updates. I have seen almost zero status updates and i have sent zero status updates.

This is, apparently, (16.7 / 1.4 ) × 100 ≈ 8.38 % of all traffic documented by my WhatsApp usage counter. .. and it is just wastefulness, probably to boost someones KPIs or something.

Compare that to Signal, where you can disable that entire feature in the settings.

Another example: Even though I never listen to voice messages, the app insists on downloading all of them. While other media can be configured to not download automatically, downloading all voice messages is mandatory.

Maybe in some group I am part of, WhatsApp is downloading a voice message (that I'll never listen to) right now.