It’s likely you have enough money that it isn’t prohibitive to you. I think most people would find $10 a month for file syncing crazy. Why would I pay for that instead of Google Drive? It’s one more company I have to share my data with and hope they don’t lose it/get hacked. At least I can log in once with Google (or OneDrive if you are in the Microsoft ecosystem) and two factor authentication and be done with it. I don’t understand the Dropbox business model at all. Hoping people are uninformed about better alternatives? 9 billion market cap for that?