>We're not encouraging spam with this.

what you encourage and what actually happens are two different things, though. gmail does not actively encourage spam, yet most spam emails i receive are from gmail addresses.

you have to actively fight against malicious uses, like spam. "not encouraging" is nowhere near enough.

what systems/processes/safeguards do you have in place to prevent abuse?

I agree. We're not completely self-serve right now, so we get to talk with each potential customer and learn about their use case before onboarding them onto the platform. This way, we can prevent use cases that involve spam or abuse.