Sure, but it's not their site, it's mine!

And they're not obvious mouse slips like redirecting googl.com -> google.com - they're more of the form <verb>mydomain.com.

I was mostly interested in what the actual play from them here is tbh

Maybe they’ll try to build up traffic to your site from those domains and then push to sell them to you/extort by removing the redirects?

Just feels like such an odd play lol. If they could organically generate leads/traffic that I'd be willing to get extorted over, then surely they would also have the means to start a marketing agency that I'd be willing to pay far more for?

Backlinks to which site?

The fraudulent domains are only sending traffic to OP.

My guess is that they want to either phish visitors, or they want to ask OP for affiliate revenue, like a digital version of the guys who wash your windshield or your shoes without asking first, and then ask for money.

Or planning to threaten to divert organic traffic through the impersonation domains away from the canonical domain, if you don't pay them.

"Wash your winshield" lol are you South African?