I'm assuming these people are after the eggs. Despite it being illegal, there still some selfish fanatics out there only interested in their absurd habit of collecting eggs.
It reminds me of my childhood in the 1970s. I met this other boy on our street who said he had something to show me. We went to his home where, under his bed, he kept a large box filled with bird egg, all nestled in cotton wool. He was so proud of his collection but I never saw the point in it. Then, he produced an egg that he'd taken from a nest that day and demonstrated 'blowing' it. I just shrugged and went off to play football with some of the other kids. Utterly pointless in my opinion.
I don't know if it was illegal back then but, if it was, I was too young to know about such things. I wouldn't hesitate to call the police on anybody who showed me an egg collection today.