LINK an exponential chart with a collection of surveys showing increased number of BTC owners at about 520,000,000.0 people in 2024 up from 390.0 in early 2009. If it were a linear chart it would probably look like an almost vertical line.

You can also purchase cards with which to buy stuff from stores from some exchanges and they convert to your currency of choice on credit, you can use BTC kiosks in most major cities, and you can use it directly at a variety of stores in several countries including Switzerland, Venezuela, and it was widespread in Zimbabwe until their central bank banned it.