[tialaramex]

The satirical magazine "Private Eye" collects these as "Malgorithmns - A feature dedicated to excellence in online advertising" and they're usually much as you described. The software has spotted a mention of idea A, but doesn't grok that the context makes this a bad time to advertise X even though A and X are associated in some way.

They also, as fair play, put in some examples from offline (physical newspaper) advertising.