This article is from the Hanggliding and Paragliding FAQ, by Joao Geada with numerous contributions by others.
Probably not, but it's hard to say as we don't actually know the
proportion of towing activity to foot launch. As towing is more
complicated than foot launch and more equipment intensive, there is
more room for error and equipment failure. However in some areas of
the US, towing is the primary method of launch and many pilots seldom
launch any other way.