Mobile applications require various permissions which can be enforced via SELinux.

SELinux policy can also be written to mitigate many vulnerabilities and vulnerability classes/vectors. Over 40% [1] of Android users may no longer be receiving important security updates, potentially putting them at risk of malware, data loss and cyber attacks.

Seems to make sense to have it enabled on Android based on the above.

[1] https://www.which.co.uk/news/2020/03/more-than-one-billion-a...