User experience is not just about optimizing every little bit of your RAM consumption. They’re are plenty of other factors as well

Same thing happens to me if I were to open each of those apps as chrome tabs.

The apps you listed provide a web version also. Adding choice to the customer experience is a good thing!

Genuine question, why does it matter? Why shouldn’t a project choose a production ready method of creating cross platform compatible code to avoid duplication of efforts and cost?

Has the hacker group given any proof that they actually have anything? All of the articles I’ve read only say the hackers have claimed to have 80GB of data.