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I have a great idea! Make the basic plan at the same time the allowed number of devices 4-5. 3 is very small. You can also increase the amount of memory to 3-4 Gb. I will be very grateful to you!
To be honest, I would not only plan to implement the personal plan with storage space, but also more storage space for a free Dropbox account maybe with 3 or 4 GB. That would encourage more people to try out Dropbox first.