Didn't we have a thread about Spam a month or so ago? :-)
It happens with many forums online, for whatever reason spam is continuously posted even though they are eventually deleted. It is a never-ending game of cat and mouse.
I hate to say it, but I really only participate in Speaker's Corner mostly now. There are too many threads where someone is looking for the impossible. Gaming PCs to run the latest system-killing blockbusters for £300, mobile phones for less than the cost of a trip to the cinema that compete with an iPhone/Pixel 4, etc.
I understand the nature of forums and not everyone will bother to post a reply or say what solution they found helped. That in itself has probably put many off.