Just as a counterpoint, about 2/3 of the enterprise contracts I've either helped fulfill or reviewed has specified the tool (and sometimes a minimum version but that was only twice out of ~25-30 contracts I've seen). That being said, for the mast majority of those (90%+) the client was very reasonable, and if we had a good reason to remove a specific reference to Veracode, for example, they would probably be fine with it. But I could definitely see it becoming an issue if you just sign the contract to close the deal and try to get out of using Veracode later, especially with whatever the client's internal approvals/review process is.