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Microsoft starts testing ads in the Windows 11 Start menu
(www.theverge.com)
This is a most excellent place for technology news and articles.
Not to worry MS is coming for shell customizations, too. https://www.neowin.net/news/microsoft-is-blocking-windows-11-build-upgrades-on-systems-with-startallback/
Start11 will probably last a bit longer because it uses only documented APIs but I don't trust em
Edit: there's also the possibility these ads get injected straight into the official APIs, in which case start11 would just show them as well.