We don't anticipate this will happen for a few reasons. When the usage of SkyPilot (or a SkyPilot-like "intercloud broker" system) is small, it probably doesn't warrant the dominant clouds' attention.
When the usage gets bigger, I'm not sure how providers can restrict access anyway (curious if there are precedents). There are quite a few large multicloud platforms like Snowflake or Databricks heavily utilizing AWS/GCP/Azure already. (Granted, these platforms are not meta-cloud, in the sense of moving their customer workloads transparently across clouds.)
Ultimately we see such a system to grow the pie for the whole cloud market. The incumbents' relative shares may drop, but their absolute volume will grow.
When the usage gets bigger, I'm not sure how providers can restrict access anyway (curious if there are precedents). There are quite a few large multicloud platforms like Snowflake or Databricks heavily utilizing AWS/GCP/Azure already. (Granted, these platforms are not meta-cloud, in the sense of moving their customer workloads transparently across clouds.)
Ultimately we see such a system to grow the pie for the whole cloud market. The incumbents' relative shares may drop, but their absolute volume will grow.