Files such as src/library/base/R/license.R state
# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation; either version 2 of the License, or
# (at your option) any later version.
Invoking license() clarifies this which is good. It may helps those who already have R installation and look at the startup prompt.
However, FAQ 2.11 has no 'greater or equal than':
2.11 Can I use R for commercial purposes?
R is released under the GNU General Public License (GPL), version 2.
I suggest you alter this accordingly.
Also, license() etc have
cat("\nThis software is distributed under the terms of the GNU General\n")
cat("Public License, either Version 2, June 1991 or Version 3, June 2007.\n")