If you have a #platform team channel don't let that become the place the rest of the company comes and makes unfiltered requests. That's the channel for your team. It's really important to have that boundary, otherwise they don't have a safe space to communicate and have to resort to private channels. People should be able to see what the platform team discusses but not necessarily just start asking random support questions.

Also, try create a knowledge base for the rest of the company. If there's frequent issues that are already resolved which others could just search a page for or some runbook for things they can do themselves it's best to give them that "self serve" method.