It's unfortunate that legitimate license holders have to be "spammed" with this. It is a reminder, not to those of you who use the Tournament Director for personal (i.e., non-commercial) use, but to those who are using the Tournament Director for profit or indirectly as a profit boost for their business.
The software is priced for business, for-profit use, but I heavily discount it for personal use. The most common license violations are businesses (casinos, card rooms, etc) having their employees purchase a personal license and then using that license for their business. The second most common license violations are businesses (casinos, hotel chains, etc) buying a single commercial license and then using it for all of their properties, or poker hosting businesses buying a single commercial license and installing that license on all 20 laptops used by their 20 tournament directors. This reminder is to them. I'd really rather them license it properly than take them to court.
I realize it's an annoyance, and I'd be annoyed as well. I'd take it out if I could. But it is configured to only show itself upon start up of the application, and never more than once in any 24 hour period.