[mistamca]

It's marketing bro....everybody easily remembers @gmail.com.....hahaha....

Using a gmail isn't marketing. You can get a secure, privacy-centric custom domain email for 4 bucks a month.
Gmail doesn't look professional. Branding is marketing too & gmail doesnt help build a brand. It isn't lost on me that most 1-man bands dont really care about a brand because there isnt a company to build a brand around. How do you even do email marketing with a personal email? This seems like an absolute nightmare.

I can't imagine that a gmail builds confidence especially in MCA where merchants receive a ton of communication