I understand AWS UX is quite bad (I have also personally been bitten by GCP UX) and would be more sympathetic with the OP if this were the cost for 1 or 2 months.
If OP didn't notice it for 8-9 months, I do think it's unfair to blame the entire amount on AWS.
If OP didn't notice it for 8-9 months, I do think it's unfair to blame the entire amount on AWS.