Normalizing this would start a game of cat & mouse, no?
(Anecdotally) I don't think most big corps using commercial software without a license are doing it intentionally/maliciously at an organizational level. Most of the time it's just individual employees downloading supposedly "free" software without reading the license and not realizing it isn't free for commercial use.
And chances are, that company's IT department would love to know when that's happening so they can put a stop to it.
I work in ops, that's called "shadow IT" and it's a huge problem. It's really prevalent now because most SaaS is marketed toward individuals/small teams rather than marketing toward the business itself, so you get people within an org spinning up trials and free versions, putting company data into it with zero oversight, and often IT doesn't know about it until the quarterly budget review when they find out from accounting that it's been blown on software purchased outside of the IT org, now it's "critical" to operations and we're forced to onboard/support it.
Obviously these code snippets won't work for SaaS, but a notification pop-up along the lines of "We see you're on a company device. Please contact your IT administrator to proceed with your free trial" would be great, but would kill a big sales avenue.