It shouldn't take more than 1MB, but a "power user" with the stock Slack desktop client will probably see RAM usage of 1.5 GB[1]. So* GP was referencing the fact that currently the Slack desktop client is using >1GB and that is way too much.

* I recognize your sarcasm, but figured I'd reply anyway since the internet is a weird place and lots of people might not catch the joke.

[1] https://medium.com/@matt.at.ably/wheres-all-my-cpu-and-memor...