Honestly I'd be really careful with third party case opening sites because most of them are rigged against you. I used to waste money on those until I learned how the actual CS2 market works. Now I just trade skins directly and study market trends using https://dmarket.com/cs2-wiki/ to understand real values. Way safer than gambling on random sites that might not even give you anything. The official game cases are already hard enough to profit from so external sites are usually even worse odds. Better to learn trading and buy skins you actually want instead of hoping to get lucky with cases. Most of these third party sites just take your money