More people are now paying attention to Bitcoin. Bitcoin's explosive growth in value over the past several months owes much to the fact that relatively few people owned Bitcoin before this summer. Now, a lot more people are paying attention to and investing in Bitcoin. The resolution of the Bitcoin scaling issue, the passing of worries about the deleterious effects of a Bitcoin fork and other developments have drawn more attention to the currency. What this means is that people who buy Bitcoin today are not getting in on the ground floor. Bitcoin's growth may continue for a long time to come, but it will certainly not be at the incredible rates of this summer.
Bitcoin Cash was forked from Bitcoin and therefore has a similar infrastructure supporting it. BCH implemented larger block sizes than Bitcoin to fix network congestion, and they have gone on to be the most successful Bitcoin offshoot. Bitcoin Cash wants to compete with other payment processors like PayPal and Visa in terms the number of transactions they can process on the network.
A successful hard fork for Bitcoin Cash entails surviving long enough to entice individuals and companies to use and mine the new digital currency if it is able to build substantial interest and reach critical mass. Once this point is reached, however, Bitcoin Cash may find that its success has prompted others to develop their own alternative coins, which would put the same pressure on Bitcoin Cash that it had placed on Bitcoin Classic. Since the issue of scalability tends to be at the forefront of cryptocurrency debates, developers have made increasing block size and improving transaction processing speeds their top focus areas.
Bitcoin has forced itself to become an investment; the severe volatility its value goes through on a daily and even hourly basis makes it much harder to use as currency. By the time a bitcoin transaction is complete, it could be worth less than it was when you first tried to use it. That has made it seem more viable as an investment than as a currency to many, but investment analysts remain wary of bitcoin still.
Bitcoin Cash was a different story. It differs from the other versions in that in enabled the increase of the block size from one MB to eight MB. It’s overall goal is to increase the number of transactions that can be processed by the network, hoping that Bitcoin Cash will be able to compete with the volume of transactions that industry giants like PayPal and Visa can currently process.
While the number of companies and industries that allow cryptocurrencies to be used to pay for goods and services is constantly increasing (you can use Bitcoin to pay for some things on Expedia and Microsoft, for example), the vast majority of people who buy Bitcoin or other popular cryptocurrencies still primarily use them as long-term investments. Cryptocurrencies are a new market (Bitcoin was first introduced less than a decade ago) and therefore an extremely volatile investment. In this pricing graph from Coindesk, you can see how the price of Bitcoin has fluctuated since it first debuted almost a decade ago, down to daily changes in value.