Not so much “on our platform” (services are surprisingly free in terms of technology and process) but “by our principles”. The GDS assessment process did indeed have clout, in the sense that services could fail, and failure had consequences for funding.
I did two 6-month stints as delivery manager on GDS “exemplar” projects. I remain a fan.
Maybe not platform per se, but through your domain. There's a huge power in that (as gatekeeper of content). It means department's have no choice but to adhere to the standards and recommendations.
The exemplar projects in the Australian system were discontinued after the second round, and were really just lip-service -- at the end of the day, even the exemplar projects were at the mercy of internal Departmental IT operations who ultimately decided what went on to their Departmental domains.
I did two 6-month stints as delivery manager on GDS “exemplar” projects. I remain a fan.