> The conditions seem clear, if your artwork is selected
I believe the "if" in your sentence is the "on spec" part. You spend time (effectively money) working on something that may or may not get used and thus paid.
> The 'spec'/agreement doesn't seem ambiguous.
"spec" isn't specification in this context; it's more akin to "speculation". Oxford dictionary gives "on spec" as "in the hope of success but without any specific plan or instructions".
I believe the "if" in your sentence is the "on spec" part. You spend time (effectively money) working on something that may or may not get used and thus paid.
> The 'spec'/agreement doesn't seem ambiguous.
"spec" isn't specification in this context; it's more akin to "speculation". Oxford dictionary gives "on spec" as "in the hope of success but without any specific plan or instructions".