What is the cause of recent internet quality decline?

Internet performance has declined in recent days, the Deputy Communications Minister told state-affiliated Fars on Telegram, saying domestic-origin DDoS attacks outnumbered foreign-origin attacks over the past 10 days. He said this could indicate that users’ devices inside the country are infected and being used in botnets. ▸ The deputy minister described DDoS attacks as cyberattacks that overwhelm a server or network by sending a large volume of requests from many devices, disrupting service capacity and reducing or cutting users’ access to internet services. (Source: Fars (Telegram))

Initial synthesis; final edit pending