Usually some regulation change that the company is not aware off, they have to run to find a fix as soon as possible, some business guy who don't know anything about tech find a vendor who are ready to sell a solution (they probably created their whole business last month on a gamble that the new regulation would be passed and that businesses would be rushing for a solution). Then they simply buy that solution "for compliance" as a top down decision, even when internal employees ring the warning bell.