Comment by hobofan

One quick data point (might be not the most accurate, but I just looked into it a bit and thought I might as well share it): According to a quick look up with Sumble[0], ~120 out of Fortune 500 companies show any interest in COBOL.

Out of those it looks like about ~60 of those are actually using COBOL in-house, while most job postings from the rest are mostly "has experience with dealing with legacy COBOL systems". The top ~40 users are the ones you would expect (big banks, insurances, telco).

Of course this is a very LinkedIn/job postings lens on it, but in terms of gauging how big the addressable market for such a solution may be, I think it should do a decent job.

[0]: https://sumble.com - Not affiliated, I just quite like their product