The kind of feedback tech startups need

Blue Prism just got a great write up about their work with the Co-operative Bank, where their software is increasingly being used to automate processes.
It's great when a large company is willing to help spread the word for a relatively young company like Blue Prism, it's a simple and comparatively painless way in which a large company can support a supplier.
What I find slightly disappointing is that it seems to me that very often the large purchaser will not offer their vendor this kind of support. For example, Blue Prism has some other similar companies who appear more reluctant to go on the record about their work with the company.