[direwolf20]

You can't impersonate Google. Sites check the source IP and they don't overlap with Google Cloud.

[wolvoleo]

Google isn't the only search engine in the world of course. It probably is pretty much the only one that matters in America but the world is not just America either.

[direwolf20]

It's the only one websites don't block. That's one reason it's so hard to make another search engine.

[chrisjj]

You can for sites that can't afford the cost of keeping up-to-date with the Google IP list without which they can lose timely indexing. That is many.

[otterley]

What do you mean by “afford the cost”? The list is free of charge (https://support.google.com/a/answer/10026322?hl=en-GB) and maintenance can be fully automated.

[chrisjj]

I mean cost of server setup and execution.

[otterley]

The server that is providing the content exists already. That's a sunk cost.

[chrisjj]

"setup and execution".

[otterley]

What serious operator of a service isn't budgeting time to implement and operate critical maintenance functions?