👨‍🦱 💬 Capital Expenditure describes an action of spending company funds upfront.

👨‍🦱 💬 In Operational Expenditure model you spend money on services every month as you use them. As such you deduct the tax in the same year. This might vary in certain countries though.

👨‍🦱 💬 Your own infrastructure means you need to purchase servers. Invest in the server room, cooling, networking, etc. This of course costs money, which means you need to invest a lot of money initially. Later your costs are relatively low.