Ditto. I have some not-small systems based on s3, lambda, SNS and SQS that have been running for years without issue - just quietly, and inexpensively doing their jobs.

New stuff I’m building is putting StepFunctions in rather than Lambda if at all possible, and DDB alongside S3 for indexing. I expect these to be nearly maintenance free (no runtime updates, no package updates, TTLs to expire data).