row level security and publish to web
If a report is published via web, when you implement row level security on the underlying dataset, it takes away publish to web option from the report. Previously shared link via publish to web will still be active but users won't be able to see any visuals in the report.
Warning message would be nicer to indicate admins that when you implement row level security publish to web option will not be available for that report.
Also previously shared publish to web link should be automatically be disabled.