Yes and no. Cloud in itself has no security. Apart from the fact that on the outside (and sometimes on the inside) it is not visible what the physical location of your data is in the whole. But the more fish in the sea, the more fishermen on the water & the bigger the fish, the more effort one puts in to catching it. So it is with valuable data. So a cloud service is a valuable object for hackers because of the large amount of data. Your network is much less interesting.