Marco Bello | AFP | Getty ImagesBlock shares plunged 18% on Friday, their steepest drop since 2020, after the company reported fourth-quarter earnings that missed estimates and issued guidance for 2025 that failed to reassure investors.In its financial report late Thursday, Block reported earnings of 71 cents per share, falling short of the average analyst estimate of 87 cents, according to LSEG. Revenue of $6.03 billion also missed expectations of $6.29 billion. The company posted $2.31 billion...