No I don't. Didn't say that. Governments have computers which, at the behest of many agencies, simply look for "words" and alert agencies that have an interest. Do not fool yourself. Countries look everywhere for their moneys, at little cost or effort, computers are perfect for this. The program finds a combination of words which may trigger monitoring a poster. No humans involved. At a certain threshold, including certain terms, customs would be notified. Whether customs follows up is entirely up to them.
A couple hundred dollars, pounds, Euros, etc. soon adds up when it comes to cigarettes.cigars.blends, booze, tusks, animal parts, contraband of all sorts, etc. There are thousands of items to be tracked, few humans involved in the tracking, just some quietly idling computers in well cooled rooms attended by a few techs. Porn sellers are located in this manner, illicit weapons sales are monitored similarly. The computers simply cruise the net, looking for "key" words. Find a word(s) and AI/app probes further. All very simple and easily accomplished at relatively little expense. After the hardware is purchased, coding is the most expensive tool. In some cases the owners of social internet services are co-opted to feed government. Intrusive government is here ... to stay.