The most commonly used term to describe Androids diversity is Fragmentation The Android ecosystem is built up from many different developers, manufacturers and carriers. One of the biggest consequences of fragmentation is that a vast number of users numbering in the hundreds of millions are left vulnerable to malware and data theft as a result of unfixed coding vulnerabilities. The problem is made exponentially worse by the fact that neither manufacturers nor the carriers feel the need to actually push out these updates and make sure people install them.”]
Source: https://informationsecuritybuzz.com/news/fragmentation-android-ecosystem/