Acceptable complaint and spam rates
If you have connected your AWS account to EmailOctopus, we rely upon Amazon as the ESP (email service provider) to monitor and control the variables of spam.
Regarding complaint rates, there is not a "definite" figure which will result in a ban from EmailOctopus and Amazon SES. Generally speaking though, try to keep these around 0.1% or below for your campaigns.
If you'd like to familiarise yourself more about how AWS handles complaints read here.