Google is known to remove bad suggestions. I suspect they deliberately avoid anything contentious.

If you try "Donald Trump" and then start typing Collusion, it won't suggest collusion until it gets to "Donald Trump Collu" at which point it suggests.... "Donald Trump Collusion Speech".

From Google's own documentation[1]

>If no predictions appear for a search term, the algorithm might have detected that:

>The search term isn't popular.

>The search term is too new. You might need to wait a few >days or weeks to see predictions.

>A potentially disparaging or sensitive term was associated with a name and an automatic rule was applied.

>The search term violates Google’s policies. Learn more about Autocomplete policies.

Basically they just avoid anything controversial.

[1]https://support.google.com/websearch/answer/106230?co=GENIE....