<…> Where can we find statistics on how many Ordinals were moved? Do you know of any viable sources on the subject?
There are a bunch of Dashboards on Dune that analyse Ordinals data.
My Dashboard there (which I've just updated to the most current available data), for example, sets today’s insofar Ordinal TXs to be 280.075 (out of 367.726 total bitcoin blockchain TXs). That’s a 76,2% ratio, though the data for today is yet partial.
Yesterday the ratio was 73,2%, whilst the day before It was 30.1%, being "that low" for quite a set of preceding days.
The above data derived from the tab labelled "Weight of Ordinals per day (blocksize)", and focusing on the right hand side last 4 columns (you may need to scroll).
ordpool.space gives you a visual per block vision, but does not aggregate data, and actually takes ages to fully paint a block’s ordinal related TXs.