Adding tools like this can make sense for some platforms. Of course, there are cases where it won't help much, especially when the content is encrypted and the server cannot inspect it.
For example, if you run ClamAV with Nextcloud, it can help prevent a malicious file uploaded by one user from reaching another user who might be on Windows. Not everyone using these platforms is running GNU/Linux.
Microsoft has historically dealt with a huge amount of malware targeting Windows, mainly because of Windows' large user base, so they have a massive amount of threat intelligence and malware data.
For GNU/Linux users themselves, I don't think traditional antivirus provides the same value. The threat model is different, and what is considered a "malware problem" on Linux is often very different from the Windows ecosystem.
So I see tools like ClamAV more as a service-side protection layer for users, rather than something every Linux desktop user necessarily needs.
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