Yes, custom events would solve the problem.
Please, check Non-Interaction Events in order to understand that you can create events that do not affect time or bounce.
In this case, I will use the following:
Event on scroll (more than 50% of the site).
Event on time (depends on the video. You can use setTimeOut).
Event on video player (play/stop with Non-...
If you have only just created the list it will take some time to populate; whilst it forecasts how many people would have been added over the past 7 days, it won't add people retrospectively. Only people from this point on who match the criteria would be added. By the sounds of it your list should become active in a few days.
You can use the lists via Adwords even if you do not use Analytics
with Analytics you can use segments to create lists, which means that you have a higher level of granularity (which in turn means it's much easier to shoot yourself in the foot by creating lists that do not contain enough users)
Note that AFAIK remarketing lists are not yet available in ...
You can remove the standard conversion script and Google conversion tracking from GTM itself. Keeps it clean.
Note - Google Conversion tracking is different from Google Remarketing tracking
Steps to setup Google Conversion on Google Tag Manager (Copied from the guideline to avoid link click)- Link to Google tag manager conversion tracking guide
It is spyware as according to this site:
When your browsing experience is disrupted by annoying third-party banner and pop-up ads, Google Lead Services could be the one to blame. Although its name may suggest that it has something to do with Google, the truth is that it does not.
So it seems you're using Adsense as a feature of your site and not just as a source of revenue. I would say that's counter-intuitive to the point and purpose of Adsense and software like it. Adsense is working from the wealth of knowledge it has gained about your users and algorithmically finds ads it thinks will get better conversions. Sometimes that means ...
I think that there isn't any way to refuse them in Adsense. The "follow me" ads are an option in Adwords and is called "Remarketing".
You can find documentation here: