Links in your footer don't get a lot of attention from Googlebot and its friends.
Search engines are interested in the links that you want real people to follow, because those are the pages that you're visibly and actively promoting from your site. Footer links don't come into that. The reason that you've put those links in the footer is because you're not all that bothered about people seeing them ... they are there if people are looking for them (and when people are looking for things like T&Cs, contact page, sitemap and so on, they usually know to look at the bottom of the page), but they aren't up front and shouting to get people's attention. So if you don't think they are worth putting front and centre for real people, why would search engines be bothered?
For standard pages like T&Cs and the sitemap, that is the most appropriate place for them. Google understands what T&C and sitemap pages are, it knows under what circumstances to put them in the SERPs, and it knows how to use the sitemap to spider and index the rest of the site. But it also knows that, most of the time, it isn't going to be the right page to show to people – the home page or other content pages are going to serve them (and you) much better.
I'm not saying that you shouldn't have footer links – far from it, they are a useful and common design feature – but don't expect them to confer a whole lot of googlelove on the pages you link to from the footer.