I have never heard of an employer detaching a noncompete from the terms of employment, much less offering anything like $100k as a carrot. If some employers do this, then cool, but I don’t find a lot of merit in arguing about whether it’s OK to do something that almost nobody does.

Many many employers attach noncompetes to the terms of employment, won’t modify them for anyone and have the leverage to make even developers sign it (the job market’s good, but it’s not that good). That’s a bad state of affairs, and it really seems like employers won’t drop this unless compelled to, we aren’t going to be able to negotiate them into the deal you’re describing.