So it sounds like you gave them an opportunity to use their devices productively, and they couldn't, so they don't get to use your phone. Had you not been able to do that, your screen time would kick in and do the same to you. Seems reasonable to me?

I did, I watched very closely (and took estimated times) for a couple weeks and they were obsessed a couple years back. All they wanted to do was be on the phone or switch. If you close some doors then other doors will open up. Board games, actually sitting down and telling their day to me (and their mom), playing with the cats and dog. Etc. I give them a lot of freedom until around 8, everyone needs personal time that they own, including kids, then it's back to business of being a family and homework.