Thanks for your response :) In my experience almost all companies claim to respond to applications or inquiries but I expect most seekers would say it's more like 1/10.

It may be worth mentioning that you're continuing to open new positions and hire in the next thread. That would be (imo) a positive signal for others and would dispel these types of concerns. Because like others have said, they remember the companies who post over and over again and tend to not bother with them, under the assumption that they just aren't filling the position (if they even exist).