Depends if it’s declared as ‘treasure trove’ or not. If it is, the treasure is basically requisitioned and the finder is compensated along with the landowner for the commercial value of the coins. My understanding is that a find has to be unique or unusual in some way to qualify as treasure. Most of those look like bog-standard post-Diolectianian reform 3rd to early 4th century roman coins to me. Although the condition they’re in is pretty good for a bronze hoard....