Strange spikes in download activity

I have a free app that is useful for amateur astronomers and astronomy educators.

Just this past week I've been seeing strange spikes in my downloads. Normally I might get ~5 downloads per hour. However, now I'm seeing spikes of 300 to 600 an hour coming from Germany. It will only be in an hour that I get the spike. in the hours immediately before and after activity is normal.

All I can think of is that some educational institutions have discovered this and are doing mass "purchases" to supply iOS devices in a lab or on a campus. This might appear as a large number of downloads within a particular hour.

Does this sound right? Anyone else get these kind of spikes?

Strange spikes in download activity
 
 
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