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VPC sharing is the sleeper here. You can do cross account networking all in the same VPC and skip all the expensive stuff.

as long as your VPCs aren't too big, yea.

Shared vpcs can get pretty big. Even if you approach the NAU limit you can use privatelink or TGW to have more large shared vpcs.

If you are exhausting an entire VPC I’d be pretty impressed!

Used to work at nflx, biiiiig headaches