[diwo]

Let's see what Internet Archive says about this. In April 2013 the Bitly homepage looked like this:

http://web.archive.org/web/20130401021533/https://bitly.com/

It had the new brand in use, and it had a "You Business?" link to Enterprise site:

http://web.archive.org/web/20130404123817/http://www.enterpr...

The enterprise site advices you to contact them for pricing.

[missblit]

For reference the ToS from March 2013 is here:

http://web.archive.org/web/20130320100810/http://bitly.com/p...

It still contains the clause outlining that the free version is for non-commercial use only.