The Dropbox help page on their service limits (updated March 2019) does now reference a 3-device limit; however, apparently this limit is for Dropbox's own apps and not applications like eWallet that use the Dropbox API.
Please see the following Dropbox page for more details on Dropbox indicates the limit does not apply to eWallet:
Please note that you do not need to have Dropbox installed on your device to use eWallet's Cloud Sync via Dropbox. eWallet contains all of the necessary parts!
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