If you read their terms of use, their definition of content that falls under the category of spamming is similar to many of the other centralized video platforms you speak of, and it would cover a wide net of accounts, reading their legal section this specifically is probably what got you booted:
content created with the sole purpose of promoting third-party sites or service
I'm not saying that's true, however that's probably how they classify your content in this instance.
Also, if you have any links to external content in the description, that's another strike they could use in classifying your account as spam per their terms of use:
content intending to misleadingly direct users off Dailymotion to an external site

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