To me, that's the opposite of lock-in. You can leave AWS because you can move away from any one service easily without affecting the others. There are even vendors who directly implement (for example) S3's API so you have almost no code to change.
Traditional vendor lock-in is when you can't move away from (e.g.) your Oracle database because you've got a dozen different applications that will need simultaneous rearchitecting if you ever want to get away from it.
Traditional vendor lock-in is when you can't move away from (e.g.) your Oracle database because you've got a dozen different applications that will need simultaneous rearchitecting if you ever want to get away from it.