Some people are cashing out big time from drop service and you are here saying it does not work. Your understanding of what it means and how others are playing it is different. Services that can be dropped are video editing, leads generation, etc. You can get a client that needs leads paying $1000 per month and you can get someone to generate the leads for $500 per month, then you have a profit of $500 per month.There are courses ebooks and youtube channels claiming they made lot of money with it. Here is the problem. Fiverr take like 30% cut for each transaction seoclerks takes 15% cut. So does freelancer.com, upwork. It does not work. Don't waste time on it.
Everything depends on how you play it. But for the fact that you assume thing and then say drop service does not work, that is what i find uninteresting.