Why don't large organizations such as Google, Microsoft, Amazon, etc. provide a looking glass tool?

Hi,

Why don't large organizations such as Google, Microsoft, Amazon, etc. provide a looking glass tool for network troubleshooting? (For example, to inspect the BGP table/best paths or traceroutes).

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Correct me if I am wrong on this... but i checked PeeringDB and apparently none of them do.

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Since they host a lot of content and services, e.g. from their respective cloud platforms wouldn't it be beneficial for everyone else?

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Without being able to inspect how the other side sees your network means any sort of troubleshooting is guess work at best.