Add comments about TGPPL OSI approval question

dosp-survey.ltx

@@ -311,6 +311,13 @@ Transitive Grace Period Public License (TGPPL).  This license was mainly
 devised by Zooko Wilcox-O'Hearn.\footnote{It implements a strategy previously
 proposed by Ted Ts'o, at \otsurl{https://thunk.org/tytso/TPL.html}.}
 
+% https://lists.opensource.org/pipermail/license-discuss_lists.opensource.org/2013-July/018428.html
+% TGPPL was submitted for OSI review in 2009 (!) but was never approved.
+% There are some discussions that seem to imply that people were reluctant
+% to approve it from nascent concerns over license proliferation and some
+% prudential concerns about whether this was the right approach to
+% relicensing.
+
 It is worth pointing out that the BOSL has no connection to the Bootstrap
 web framework project, which is under the MIT license. Both projects
 independently use the term ``bootstrap" to refer to the concept of