Because Telegram was not deemed a gatekeeper to the instant messenger market by the EU, so the DMA doesn’t apply. You have have millions of users in the EU and almost a billion in revenue, I think, to be deemed a gatekeeper. The Digital Service Act does apply to telegram though, I think. That one doesn’t force interoperability though

Interesting! I didn’t know that, thanks for responding

You can. Google pixel updates are just a reboot. Sadly many OEMs don’t do A/B updates, like samsung, so your phone can’t be used while updating the system partition

No, it’s used much more often. How often is determined by a value called swapiness.