Malicious apps got into the Arch User Repository - how to protect yourself

For the second time in a week, the AUR was found to contain malicious applications. What can Arch Linux users do about this?
Research Snipers

Major attack on Arch Linux: massive malware injection into the AUR

Arch Linux continues to struggle with a large-scale malware wave in its user repository AUR (Arch User Repository). This is currently literally flooded with malware. The attack continues and becomes ...
GamingOnLinuxOpinion

The security situation with the Arch Linux AUR got a lot worse

Oh dear, the situation with the Arch Linux AUR got a fair bit worse since GamingOnLinux initially covered the malicious ...

Attack wave on Arch Linux: hundreds of package descriptions with malware in AUR

Arch Linux defends itself against a wave of attacks that have massively contaminated package descriptions in the unofficial Arch User Repository with malware.