Asset licencing for hobbyists

Good day!

The background:

I am part of a group of hobbyist game designers. We did some modding (story mods, total conversions) in the past and became quite good at it. All printed German gaming magazines accounted at least one of our projects. We also did some indie games recently, which are sold on Steam.

But we do so for fun, not for the money. Thus we never started a company. We just work together for how much time everyone wants to and share the revenue if there is one (most of our projects are still mods and available for free).

Now we've started the development of a big Unity city builder game. The decision if it will be sold or available for free depends on the quality we will achieve. But we need some assets from the store for it, because we are a small team and don't want to design every tree and skybox on our own.

The question:

Is it true, that due to the non-company nature of our team, everyone has to buy his own license of any asset we use, even though all work on the same project?

Because if so, we can't use Unity anymore. We as hobbyists would have to pay many times the amount that the professionals do. Which seams juridically correct but not really fair to me.

Thank you in advance!