A little comparison of the BCIs that are mentioned in the comments:

This product (Science Eye) intends to cure very specific cases of blindness, nothing more.

Synchron seems to mostly aim for letting people control muscles. It has the benefit of remaining in the vasculature but it couldn't get as close to the cortex as neuralink could, therefore it couldn't read/write from individual neurons, only groups of them. Enough to move large muscles, not enough to hear/see/etc., I'd estimate.

Neuralink wants a direct interface with the cortex. To read/write hearing/vision/movement with very high resolution. However it's much more invasive than both of the former and has a higher potential of surgical complications and scarring.

So assuming they will work as intended:
Science Eye: Cures some cases of blindness, low invasiveness.
Synchron: Cures some cases of paralysis, medium invasiveness.
Neuralink: Cures blindness, paralysis, deafness, enables full-dive VR, transmission of thoughts, etc. Very invasive.