Speaking of digital marketing, in addition to MA tools, there are various types such as Google and Yahoo advertising, Google Analytics and other web analytics, and Facebook and Twitter and other social media.
To what extent are competitors interested in digital marketing? Of course, if you analyze the HTML source, you can see it, but it takes time and effort. Here’s an easy way to check using your browser extension.

Ghostery
Ghostery is a browser extension that aims to protect your privacy information from advertising and social media tracking. Let’s take advantage of it and see what trackers each website uses.
Search Ghostery and Google and install the add-on for your browser. (You can also use it in Japanese).

Register in the bookmark bar so that you can use it at any time. Click the puzzle piece-like icon to see the installed extensions. Click the Ghostery pin. All you have to do is go to the website you want to check and click on the ghost icon.

This is the website of a certain processing industry. I thought I was putting a lot of effort into digital marketing, but I can see that it contains 8 tracking codes. Google, Yahoo ads, Google Analytics, etc.
Ghostery seems to have a low number of detections of MA tools, but just looking at this number shows the degree of interest in digital marketing of companies.