I use Kubernetes every day, and have worked with dozens of helm charts, and have yet to encounter cloud specific helm charts. Are these internal helm charts for your company?

Obviously you can lock yourself in if you choose, but I have yet to see third party tools that assume a specific provider (unless you are using tools created BY that provider).

At my previous spot, we were running dozens of clusters, with some on prem and some in the cloud. It was easy to move workloads between the two, the only issue was ACLs, but that was our own choice.

I know they are pushing the new gateway api, but ingresses still work just fine.