Virtually anyone whose livelihood depends on a less-than-reliable source of income has reason to constantly worry about that source potentially reducing or even cutting off that income for reasons that can be either impossible to predict or outside one's sphere of control. An earner is effectively at the mercy of whoever they are working for at a traditional workplace, and anyone whose livelihood depends on revenue streams from running websites is perhaps even more likely to be brought low by arbitrary factors. A given website's traffic is critically dependent on whether it appears on the top pages of the particular SERPs it is trying to compete in, and far fewer individuals will be granting that site either ad revenue or potential business yields as customers if they have to go to those SERP listings' subsequent pages to become aware of its existence.
That the lion's share of financial success in the online space lies within a given SERP's first page is why competitors are constantly trying to perform as much high-quality SEO as possible to maintain their positions in that space. Google is always applying updates and changes to the metrics its sorting algorithms use to determine which SEO practices should be considered organically indicative of websites worth their high positions. Websites everywhere are therefore constantly adapting their SEO strategies to meet the latest standards, and awareness of these standards generally spreads fast enough that smaller websites do not need to worriedly view these as arbitrary decreases to their revenue streams.
There is always a degree of uncertainty about whether a sudden ranking change for a website is caused by an update. A small ranking shift may not even entail a definable cause at all, but there is technically very little stopping a website's owner from interpreting it as representing a large problem that demands a radical solution and frantically studying their SEO utilities for data that could support that notion. Since good SEO involves letting strategies smoothly run their course, web owners should always maintain composure in the face of occasional anomalies in their SEO campaigns' ongoing results. For more information click here https://www.reddit.com/r/SEO/comments/e3q9x9/peoplefreakingoutaboutrankingchangestoday/.