These types of websites are extremely inaccurate and shouldn't be relied on.
Look at the top 2 results: actblue, click on any google result. They appear because you can donate to a group and money goes to each member. Each page has the phrase "split it". This has nothing to do with SPT: https://www.google.com.au/search?q=site%3Aactblue.com+splitit
knoji, again click on any google result. They are all the same FAQ info for different companies saying they DO NOT support splitit. So your growing number of websites here is actually a bad thing. https://www.google.com.au/search?q=site%3Aknoji.com+splitit