Security concerns with this particular project aside, my dev machine does indeed have 8 GB of RAM, which Slack alone readily consumes 1/8th of whilst also using 15% of my total CPU power at rest, doing nothing at all.
There is no excuse for this - it is shoddy engineering. Sending text messages is a simple task. Ruining my battery life and performance for the sake of making it easier for the billion dollar company to ship a cross platform app which feels wrong on every platform is something I despise and I for one am extremely happy that people are trying to counter this ridiculous trend.