The economies of scale argument is not always a good argument because you need to specify where does the deal cut comes from. I think it comes from the fact that the overhead in negotiating a huge amount of contracts is more amortized. So we could have this kind of good deals if independents find a way to reunite themselves. Otherwise the economies of scale argument could basically be the answer to everything ("We need a worldwide government because of economies of scale").

Who knows what we people will find to address this issue. Maybe we'll have coworking space packages with benefits ?

You cant rely on a group and be independent at the same time!

Why couldn't independent unite themselves voluntarily ?

the act of uniting is literally antithetical to being independent. I can't even understand why you would ask that question. Why can't red be blue, makes about as much sense as asking why independent people couldn't unite and still be independent

My apologies if there was a misunderstanding over language. Your English is good enough that I had assumed you were a native speaker

I gave an example. There could be a franchise of co-working space / hotels / resorts all over the world for nomadic or independent people and they would do the bargaining for their clients.