Even with those pricing structures, 95%[1] of the spam I get comes from sendgrid. To their credit, their abuse@ address is good at handling the reports and they reply with a followup that the report was received and able to be acted upon[2].
The volume of spam (for me) doesn't seem to be decreasing from them, so there's a lot of moles to whack.
[1] Just a guess from looking at the last weeks
[2] I know it's automated, but often there's 2 that come with the 2nd one stating it's acted upon, so i'm hopeful.
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.
The volume of spam (for me) doesn't seem to be decreasing from them, so there's a lot of moles to whack.
[1] Just a guess from looking at the last weeks [2] I know it's automated, but often there's 2 that come with the 2nd one stating it's acted upon, so i'm hopeful.