Larger organisations have historically been better at using only legal software, They typically have dedicated IT staff who make it part of their job to make sure they comply. Failure to do so risks not only the fines but also loss of reputation and I think risks of liability. It would also reflect very badly on the IT department involved.
Also software costs especially for ancilliary programs where only one or two user licences are needed are small change for larger organisations.
The smaller the business the more attractive pirated software could seem as the cost of something like CAD for example could represnt a far greater proportion of revenue. It is going to be far more widespread in these areas