The number 429 is a critical threshold for PHP websites. Exceeding this limit can cause severe performance issues and reliability problems, as servers struggle to handle too many failed requests simultaneously. This issue has been recognized globally, affecting e-commerce sites worldwide due to overuse of server resources. While it’s often known as the “Too Many Requests” problem, its origins have been debated. Recent testing efforts have brought this issue into the spotlight. The debate continues about the best solutions, with caching and rate limiting being popular fixes.
Source: https://www.cbssports.com/mlb/news/mlb-rumors-dodgers-sign-reliever-kirby-yates-mets-standoff-with-pete-alonso-could-keep-dragging