CDK + AWS resource limits: Elastic IP, VPC, Internet Gateway

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Hello! I've been playing with various ways to deploy Remix on AWS via CDK, including EC2 and ECS/Fargate. I'd like to implement ephemeral environments in a pattern similar to trance-stack - but I've noticed I can only get a few instances of my stack up before running into limits on Elastic IP, VPC and Internet Gateway.

I haven't deployed the trance-stack myself. Clearly it uses a different approach with lambda, s3 + api gateway. Does this approach sidestep per-region resource limits? Are you able to have any number (within reason) of ephemeral deployments up at a given time?

Thanks for the inspiration!