Such as when Abel Tasman explored Australia and New Zealand in 1642, but didn't find anything of interest (trade opportunities) to the rulers in Europe of the t

Such as when Abel Tasman explored Australia and New Zealand in 1642, but didn't find anything of interest (trade opportunities) to the rulers in Europe of the time. If we assume that an advanced civilization will develop machine intelligence on a large scale with efficient processors and vast energy resources, it's possible that they've already fully explored the nature of worlds such as ours, and they don't have any reason to monitor them further.