It is important to note that as an AI language model, I do not have access to real-time data or the ability to browse the internet. Therefore, I cannot provide a list of the top 10 online casinos that experienced significant growth this year. The growth of online casinos can vary based on numerous factors, such as market trends, user preferences, and regional regulations. To find up-to-date information on the top online casinos experiencing growth, it is recommended to refer to industry reports, online gambling forums, or consult reputable casino review websites.