Tldr: different countries wanna do 6g differently. Actually a big problem is the big beautiful bill that just passed in the US. Wifi6e/7 6ghz spectrum that was reserved for wifi got approved to get auctioned off. But it's already a global standard. If us cell cariers buy it up and use it to make faster 6g cell speeds (short distance very high speed). That's going to fragment standards globally.

Cell carriers don't currently use anywhere near all their spectrum they already own.