No judgement here, amigo. It's your 3, Turo is as much as you want. The casual person might not notice you've installed Milds, but an avid 3 fan would notice, especially if you had 19" or larger wheels. I can't really speak to the difference in performance between Mild vs. Moderate, as I've never been in a 3 with Milds. But both springs offer safe clearance for normal daily use cases - I almost never scrape with my Moderates, so I assume the same is more than true for Milds. But, Turo isn't necessarily 'normal daily use". I love the performance and look the Moderate springs gave my 3 - I haven't had a single regret yet.
If I'm you, I'd Turo your car for a few months before installing the springs - test Turo out for a while, see how the wear/tear truly is. Testing for a few months should give you a better idea of Mild vs. Moderate vs. no springs. You've waited a long time to get your 3, so no need to rush a decision about springs, especially with so much of an unknown variable like Turo's drivers.