Slack doesn’t have spam coming from outside my company, and any “apps” that “helpfully” bother me can be silenced easily. Contrast this with email where the inbox fills with useless nonsense constantly.

“An unrecognized device signed into…”

“Upcoming birthdays on your team” (not making this up - Lattice sent this today)

Even slack sends me email spam to tell me about messages that are waiting for me in slack. LOL.