Goodman Games (Dungeon Crawl Classics, Mutant Crawl Classics) has some funky dice. But every one of those die can be simulated with a regular set of RPG die. For example, the D30 you can role a D4 with 1 = 1-10; 2 = 11-20 and 3 = 21-30. Then roll a regular d10.
The game companies make the funky die because they can be copyrighted/trademarked for a long time. It is harder to "steal" a physical object compared to a pdf of game rules.
I have a couple of sets of zocchi dice for DCC. They are just fun. I GM’d DCC at the FLGS a few years back for international role play day and the new DCC player were fascinated by the dice.
My hypothesis is while odd configurations, the dice are similar to a regular set of polyhedral dice most RPGers own so are easy to understand. The symbol dice from FFG need to be explained every dice role in for a session or two. I hadn’t thought of the copyright. That really makes a lot of sense.