Hello, folks!

I'm researching the topic of ad spam with bitcoin transactions (no, I'm not planning to do this shit).
The idea looks simple enough anв suitable for some shady gambling businesses. One collects and filters out blockchain and sends satoshi with a text ad message attached to the chosen bitcoin addresses.
But I did not find any sufficient information regarding this topic. Only a couple of articles back from 2014 or so, when someone tried to parse bitcoin addressess here on forum to send satoshi with ad message.

Have some of you faced this kind of ads?

Are there any services to provide transaction ad spam?

Why is it not popular (or am I wrong)?

Are there network limitations to prevent it?

Links and personal experience are appreciated.