Platform engineering is the discipline of designing and building toolchains and workflows that enable self-service capabilities for software engineering organizations in the cloud-native era.

Platform Engineering

In point 1, first team will be called as SRE team (not platform). Please let me know if anyone thinks otherwise. 

SRE team is not supposed to be the team to which everyone trow their projects to support over the wall.
I know this happens often in many companies, but this is not how SRE team is supposed to work.