It's odd that such a mysterious mound should have been neglected for so long. Flytipping in this kind of situation would be deterred, up here, by big concrete blocks on the kerbside. At least additive vandalism is preferable to subtractive.
"At least additive vandalism is preferable to subtractive".
I know what you mean, but this is a case where profile is all (if anything) so to see it gradually being piled with concrete blocks and garbage and then vegetation covering it and swallowing it into the original is very upsetting.