I get your point, but in the specific case of iminime I don't agree, if they actually have their headsculpts factory made, it means they limit the production runs on purpose to justify their prices (around 1000$ for a copyright infringing figure, I cough everytime I see them on sale, their latest release being the king in the north, likeness is average, no accessory or spare hands, and most outfit parts copied from threezero official GoT releases...)
And it is only a "possibility" since a lot of "recasts" are done from third party companies based on hot toys factory molds and the likeness both to the character and to the original headsculpt is outrageously obvious (and good!).
This is not the case with redman toys, their release choices are very discutable and shady for sure, as they stick to iminime's choices. But looking at their products, the likeness to iminime products is not that obvious, check for example the good/bad/ugly or pulp fiction figures, I'm really not that sure the heads are recasts, they would look ten times better otherwise.
I totally get your point about artists doing custom works, I own a few custom headsculpts myself, and I do understand they are limited in their production because they are not established companies with a budget to develop a project, they most often work at home, so the production runs are very limited.
Seeing their work copied is a shame, and it's sad for sure, but when the work itself is not legal there is nothing to cry about. It's perfectly legal to sculpt a portrait of an actor for your personal pleasure, it's even legal to sell this one piece, but definitely not to sell it in quantities, even limited.
I find it surprising how most people defend those artists (that know the risks they are taking) but are cheering up everytime a bootleg or recast is stolen from the "devil" hot toys... if hot toys is more expensive, that is also because of that licensing and rights paid for the actor's likeness, the franchise, etc, etc...
So what in the end justifies iminime limited production and pricing? Marketing strategy only, and from this point, I have very little compassion for them, sorry