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"Dply blocks common SMTP ports by default in order to prevent abuse of the platform and be able to provide servers for free."

Why do this over simpler bandwidth throttling say after a certain threshold has been met?

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Because no spam is better than a low volume of spam

Absolutely. Keeping costs low is key to having this model work. Each paid server can cover the costs of a lot of free ones but abuse policy enforcement takes people and that's much more expensive. There are quite a few transactional mail providers who offer APIs that can be used for most purposes where mail sending is needed.

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