You could indirectly promote this unnamed reference customer with a dedicated marketing page. This blog post is already the seed of a case study. List the top ten unnamed companies who requested trials, by industry sector, sorted in descending order by count and years and VMs, with them at top. Presumably #2 - #10 have much smaller numbers.
Placed in a marketing context, this human attention could be converted to revenue from other customers. Fund a creative writing competition on VeryBigCo Procurement Anti-Patterns and Shadow IT. Prizes could be paid licenses. If you get enough entries, ask a business school to do a case study on the same subject, then organize a multi-vendor survey on the topic. Also, memes.
You may also need to update the ToS on the trial. At some point, a motivated salesperson could convert the account with a multi-year license that covers both past and future usage.