So after all why this Slack channel was deleted?
They say there are too much scammers.
Quite a rational decision, it can't be moderated in a proper way.
Can't be moderated by the LAT team?

Its purpose is being a comfortable place for a few trusted friends/colleagues to discuss their projects.
That is hardly an excuse.
It's not an excuse indeed. It's a platform drawback, so the team has to select something which is moderated in easy way.
Discord!
Discord is not an ideal too.
There's a dilemma: to counter scammers a moderator should know what is being PMed, but to secure the privacy one can't allow moderators to see PMs.
And you can't just turn off the PMs, because you need sometimes to discuss something with your fellow Indonesian and it's not approved by the team.
Discord allows to turn off PMs actually.