YC doesn't control Dropbox. Whatever trust you have in a minor shareholder, it shouldn't translate to trust for the company. There are other reasons as well: p

YC doesn't control Dropbox. Whatever trust you have in a minor shareholder, it shouldn't translate to trust for the company. There are other reasons as well: potential vulnerabilities in their software, malicious/crazy/corrupted employees, etc. Healthy need-to-know rule is enough to decide that if there's no reason your cloud provider should have access to your data, he shouldn't have it.