Earlier quoted context omitted.
They used to, and they decided to download and execute random malware, and never take security updates.
Isn't that their choice?
Chrome and Firefox auto updating without user intervention by default is a good thing. If Chrome were to ask permission before downloading updates, many of them will just cancel it and get on with whatever they wanted to browse. If the system is compromised by malware because of an unpatched security issue, it is the vendor who takes the blame.