I usually perceive these ultimatums as PR stunts to the general public, so as to not appear too strict, or to appear merciful, reasonable etc. I don't expect people to actually turn themselves over.
I wonder if Iran is simply lying (adding an extra headache to mossad: figuring out if their agents are compromised) or if the collaborators realized Iran's intelligence services are good enough to catch them. And of course some may have regretted their involvement.
Most of the region is neutralized. Who else openly opposes the US and Israel besides Iran, Anshar Allah, Hezbollah and Hamas?