Technically correct, the term dust votes is something that is not even allowed on the blockchain, it is super tiny votes and the dust vote threshold was introduced to block those. It was a way to mitigate spamming.

The dust we are talking about here, linked to the $0.02 minimum payout value, I believe was introduced to avoid too many small transactions. But I feel it is less important than the dust vote threshold, and generally speaking, it is nothing normal users need to worry about. The $0.02 value doesn't limit spamming in any way, but it can have a big impact on normal users.