It's just a preference for me :3c I feel comfortable drawing for people that I'm mutual with. A lot of artists usually have the reason with "I don't have time" or "I draw as a source of income and requests/trades are gift art for friends only" but my reason is just that I rather do requests/trades with someone I know because it makes it special instead of making requests for strangers that doesn't feel like I didn't put any love or effort into it. So ye