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Is it possible to loop through every site via powershell and set the default document library to all owned sites (including Team sites) to be read-only for everyone but the owners? I've seen and tried a lot of code but I cannot get it to work.

I only want the Team Owner to be able to create documents.

Thank you.

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  • May I ask why do you want to achieve that ? Because the main purpose a site owner is to have full-control. Maybe you should consider another approach.
    – a1mery
    Mar 5, 2020 at 7:28
  • Fixed the question, I meant to say everyone but owners to read-only.
    – g33kphr33k
    Mar 6, 2020 at 19:44

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You can use Set-PnPListPermission to remove and add users/groups permissions.

If you want to change all libraries of all sites, you need to loop them, then run Set-PnPListPermission to change permissions for each library.

Two blogs for your reference:
SharePoint Online: Remove User or Group from List Permissions using PowerShell
SharePoint Online: Grant Permission to List or Library using PowerShell

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