First and foremost, .ai isn't a gTLD, but more importantly: we see these patterns in the industry already, and it's not cherry-picking because we don't see the reverse happening; businesses are not jumping from the .com to the .ai.
But we don't even have to even have to limit ourselves to this industry:
Every serious business uses the .com. Do you drive a Telsa, Toyota, BMW, Mercedes, or Ford? These companies use .com. Is your phone a Samsung or Apple? Because both use .com. What search engine do you use and what TLD do they use? Are you active on social media sites like twitter.com, x.com, youtube, instagram.com, facebook.com, or reddit.com? What is the TLD of your registrar? What's the TLD of this site? Are you seeing the pattern?
If you own the .com then you own the brand. If you own fixture.ai then you'll ever only be "Fixture dot AI," but if you own fixture.com you'll be "Fixture." If someone says go to Fixture's website the gut reaction is "fixture.com," in other words, you do not have to specify what domain you use. And if someone else owns and uses the .com they'll thank you for the traffic that you're giving them.
This is even more important if you ever want to expand beyond AI some day.
.com is a mark of provenance. There is no substitute.