The phrase "platform through which" is correct and usable in written English.
You can use it when talking about a platform that provides access to a particular activity or resource. For example, "This new website is a platform through which small businesses can access the capital they need to grow their operations."
They provided an open platform through which people could share and discuss their views with others.
Building a platform through which different groups interact requires smart thinking about strategy.
Credit Suisse created a platform through which customers can design their own financial products.
Additionally, it is a platform through which value-added traits can be introduced via genetic engineering.
Banco Santander described the deal as a "an attractive platform" through which to enter the UK banking market, which it believed had "significant potential".
The council brought together around 400 Islamic associations, giving them a platform through which they could coordinate their activities and influence government.
In 2009 he co-founded One Young World, a non-profit organisation that provides talented young people with a global platform through which to effect positive change.
Microsoft and Facebook "provided many pages of content regarding privacy but failed to offer users an unambiguous and simple platform through which to make access requests".
Neolane, which is privately held, specializes in providing a platform through which companies can manage and automate their marketing across the Web, social media and mobile.
Recognizing that ocean acidification knows no geographic boundaries, this pioneering center offers a valuable platform through which the international scientific community can come together around a single table.
Following the 2008 Sichuan earthquake, internet provider Tencent developed an online platform through which Chinese people could donate to relief efforts, quickly raising 20m RMB (nearly £2.3m).
