along with the development of digital technology, have you ever thought about the internet costs that you use for your needs ...? where we always open the market every day and trade your cryptocurrency assets, let's calculate with your income, in one day whether you always explore exchanges, social media, upload, share and other sites, is it commensurate with your income or is it commensurate with the sale and purchase of your cryptocurrency assets ...? where every time we make a sale and purchase there will be a cost, and the time we spend does not count how many hours we live on our computer or smartphone and etc, ..?
What I interpret from your message is that you aren't talking about internet costs but the time we spend on internet which we could have used to generate income elsewhere. Well we call it the opportunity cost of our time. But this concept is pretty subjective. Your income is based absolutely on your skills and expertise. While everyone has a separate skill set each skill set is valued in market with a different income. Now for this calculation purpose I would divide people into two classes:
1.One are those who don't have any other source of income basically they rely wholly on Internet as their source of income and don't possess any other skill.
2.While second are those who have a full time job but along with that like to earn income from internet.
1.
People who don't rely wholly on internet Income: These people have no opportunity cost without internet so obviously these people have no opportunity cost therefore have no "Internet Cost" in your language.
2.
People who have other source of Income: This set of people have internet costs as you say but it's not necessary. for example if a person has only 8 hours of job and uses internet in free time then obviously he doesn't has any internet costs while other may have internet costs but the beauty about opportunity cost is that it can't be avoided because you always choose the more beneficial option. So basically everyone can calculate this using their hourly rate multiplied by how many hours they spend. Compare this to what you earn on internet using buying and selling and you could practically see if this is profitable or not.