For the Italian stocks, the reason is quite straightforward: the Italian government is charging tax on all Italian stocks. This tax is called the Italian Financial Transaction Tax (IFTT). Because of this, for every trade in an Italian stock, our trading desk needs to pay a small fee. We of course still try to keep the transaction fee as low as possible, but because of this, the price for an Italian Stock is slightly higher compared to the other Stocks that we offer.
For Bitcoin the reason is different. This is a very volatile product and therefore has quite a large spread (the difference between the Bid and Ask price) on other platforms. We don't offer a spread, but a single price. However, the volatility and the larger spread is causing the product to be expensive and is, therefore, causing us to charge a slightly higher price.
If you want to know more about how our transaction fees work, drop us an email at BUX Support.