These services are just spam-circumvention as a service. It's cheaper and easier to pay 20 bucks to sendgrid and let them fight the fight with google/microsoft/yahoo than to circumvent spam protections of the big providers.
You can very reasonably and reliably expect spam amount to correlate with the cost of sending said spam or expected return. At any service. There used to be a time where you HAD to check your mailbox several times a week or it would (literally) overflow with spam.
You can very reasonably and reliably expect spam amount to correlate with the cost of sending said spam or expected return. At any service. There used to be a time where you HAD to check your mailbox several times a week or it would (literally) overflow with spam.