We have been using global announcements for things "other than Canvas" for awhile now and our students and faculty don't seem to mind too much. I've heard some grumbling, but until our school comes up with actual student portal and faculty portals, Canvas is the only common place they have right now. We have a community site for faculty and staff, but it is clunky and underutilized, and we have a student page for announcements, links, etc. but most students do not use it and go straight to Canvas. Student emails do not work to get the word out either since most students, again, do not check their school email, but go straight to their inbox in Canvas.
I do put a disclaimer on the bottom of every announcement that says "Scroll down past these announcements to see your course dashboard. If you wish to remove an announcement from your dashboard, please click the "X" in the upper right corner, but please note, once closed out, the announcement cannot be retrieved." This seems to work well if someone wants to see only their courses, but you've made me more mindful of that space becoming too cluttered!
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