For websites created by RM6 and earlier and from RM7 using the menu path Internet>Generate files for a website, plug the following search expression with quotation marks into Google Search:
"Created * with RootsMagic Genealogy Software"
For websites served by MyRootsMagic.com from the database uploaded by the RM7 menu path Internet>MyRootsMagic (publish online), plug this expression into Google Search (no quotes):
I am surprised that the latter returns only 44 results after 19 months since RM7 was released but there may be others that Google has not been steered to and indexed. The equivalent (?) Bing search expression returns only 4!
site:sites.rootsmagic.com contains index.php