Photo by dcJohn. There are a number of aspects of a theme that can get you banned from Google, and other search engines. Deciphering between safe and unsafe themes is not as easy as just looking for a “Sponsored by…” link.
Through using the methods listed below, you will be able to judge whether or not a theme is safe to use.

1 - Download From The Source

Wordpress themes are often free to download, and sometimes free to distribute. It is not difficult for a site to amass a collection of themes, and add their own spam codes to them. For this reason, if you know the site that the theme originally came from, download it from there.

Photo by -LeeB- If my theme is sponsored, will I get banned from Google?

In short, no. However, it is entirely possible that other aspects of the theme will get you banned, and even more worryingly for some is that non-sponsored themes can get you banned just as easily.

The fact that a theme is sponsored is rarely important, and should not be allowed to put you off sponsored themes altogether. The possible dangers of downloaded themes are not a myth however. They are very real, and malicious theme owners can do any number of things which could Google will begrudge you.

A Little Knowledge Is a Dangerous Thing

Most bloggers will know that when judging how to rank a site, search engines, like Google, look at links in particular. Many bloggers also know that they don’t judge your site only on the links coming in to it, but on the links going out from it. This is what has caused the commotion about sponsored themes.