It used to be said that the reason the Internet evolved so well was because of the basic principle of "be strict when you send, but tolerant when you receive". Clearly Google has forgotten this.

That is unstable if defectors are rewarded - which is a common issue on the internet.

If you are too tolerant then bad or lazy actors will cost you too much.

You end up with the tragedy of the commons called "quirks mode".

That worked when the Internet participants were mostly benign. Nowadays you have to account for abusive participants (spammers, malware writers, etc., etc.).