Meta Platforms Inc. has removed about 2 million accounts related to investment scams known as 'pig-butchering'.The scams involve online grooming, befriending victims, and then inviting them to invest in get-rich-quick schemes, often related to cryptocurrency.Meta has cracked down on these scams, resulting in fewer instances of them.The FBI has reported a sharp rise in crypto scams, with Americans losing $4 billion in recent years.