Disable "Allow Members to share the site and individual files and folders" for all sites

Hi

We've got quite a few sites where lots of files were shared causing broken inheritance on a file level. 
I want to disable the following 2 checkboxes for all sites: 
Allow Members to share the site and individual files and fold
Allow Members to Invite others to the site members groupers

I'm looking for a Powershell script to cycle through 264 Team Sites and uncheck those 2 options.

Or maybe there are some more suggestions. 
The problem I'm trying to solve is lots of files with broken inheritance from users that used the share button to share files.  

I am going to run this as well to change the default sharing method to "people with existing access"
Set-SPOSite -Identity $SiteURLHere -DefaultLinkToExistingAccess $true

Finding it hard to believe that breaking inheritance on files/folders so easily can be expected and default behavior? 

Thank You