Right now, I can't find anyone who is using Bitcoin as a payment medium. That usage came to an abrupt end in December 2017, when the miners forced us to pay anywhere from $20 to $40 for making a single transaction. Now the fee is low, but not many are interested in making the payments.
Actually, you can find a lot of people using Bitcoin as a payment alternative. You just need to look outside the forum. The period when we had to pay a huge fee to send a transaction during the previous winter didn't stay long. I mean how many time, 2 months? Bitcoin exists for a decade.
Bitcoin is the crypto currency which can be used by different people for different purpose and if you are a business minded person then you can avail the investment benefit from bitcoin as well so investment can also be mad in bitcoin.
Business minded persons invest in companies related to cryptocurrency, not in cryptocurrency itself. During the gold rush, the people who did the most profits were the one investing/selling/providing product related to gold (pickaxe and wagon,...), not the one mining gold