(In response to a now-deleted or edited post…? But still posting because it’s interesting)
Small USB-C adapters do exist:
https://cdn.shopify.com/s/files/1/1315/1471/files/USB-C_Nano_Receiver_vs_Competitors_-_Full_Annotation.jpg
(from the earlier link to Wireless USB-C – Matias)
I guess it’s patent-pending though and not very common yet. I wasn’t able to find the actual patent application in the US or Canadian databases. It’d be interesting to see what technical hurdles they had to overcome that the other manufacturers haven’t yet.
Edit: Though that did comparison did lead me to this:
https://p3-ofp.static.pub/fes/cms/2021/09/10/vxrdxs33ik2w27k1mx2bupo7ftqarj587359.png
Lenovo seems to make a wireless mouse with a small (not tiny) USB-C receiver: https://www.lenovo.com/us/en/p/accessories-and-software/keyboards-and-mice/mice/gy51c21210 (edit: which @squeegee already posted a few posts above, oops)