Why do Bitcoin traders care so much about the 200-day moving average?

Bitcoin price reached $82,400 on May 20 and ran into a line on a chart. Up 37% from its April lows, BTC stalled at the 200-day moving average, pulled back to as low as $76,000, and left the market wondering what the rejection showed about the market's underlying structure. That line, a simple arithmetic average, [ ]