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you can do this in SharePoint today (i.e. put all members into Read Only permission bucket)Anonymous commented
This is possible in SharePoint, how about other apps like planner and teams. We're wanting to use Planner to publicise department projects but wouldn't want anyone other than selected staff to be able to modify the items or buckets.
The same for teams, we'd like read-only channels (replies would be acceptable) for things such as company announcements.
While you cannot customize the default welcome mail for Office 365 Groups, disabling the welcome mail is possible with an extra parameter in the Set-UnifiedGroup cmdlet in Exchange PowerShell: -UnifiedGroupWelcomeMessageEnabled:$false. See https://docs.microsoft.com/en-us/powershell/module/exchange/users-and-groups/set-unifiedgroup
Use this as a part of a custom group creation flow if you would like to restrict and/or customize the welcome mail for many groups across your tenant.