I can't remember, do you and
@Lain have a business or a "business"? I loathe phone calls and basically get anxiety putting in takeout dinner orders so I don't know why I am contemplating this...but it's almost too good to pass up. I am strangely interested
@Lain has what can be defined as a real business IMO

but will let him opine.
I have what skews more towards a “business”, despite having sold a few items here and there.
The phone call was painless. The rep was very chatty and only asked a few basic questions like “years in business”, “how many employees”, and “annual revenue”. Have a logical story for your “business” if that’s the case and just let the conversation flow. Beverly even asked what my most popular item was (only because she was curious she said lol).
My eBay business is still very much a “business.” I’ve put a little more focus into it since I started this hobby because they kind of go hand-in-hand. Buying and reselling occasionally helps me generate additional spend towards MSR, and gives me a basis for applying for business cards. I made over $11k in sales last year (revenue, not profit), and I’m at about $6k revenue YTD, but my sales tend to bump up during the holidays. I have a pretty good sense for toys, collectibles, apparel, and electronics. For a lot of items, I might spot a really good deal on somewhere like Slickdeals, or on clearance in stores, be able to utilize my money saving/rewards maximizing skills to make it an even better deal, and I’m usually able to resell at close to, and occasionally even over MSRP. If I make some money, great; if I break even, that’s at least spend on my credit cards.
I agree with
@SBWB48 that the call was painless. I was going in ready for a fight. I’ve read the stories about calling into these Amex call centers for best offers. They usually press you for a RSVP code, and if you BS then they’ll check if the offer is actually available to you in the system. Every DP I’ve seen suggests that this offer is open to anyone who calls the number in DoC’s most recent post. I called in and said something like, “Hi, I’m interested in the Business Platinum card, and I understand there’s an offer for 100k Membership Rewards points if I spend $10k in 3 months?” My Amex rep was like, “Yes, that offer is certainly available right now. Would you like to apply for it?” Yes! He then asked me to tell him a little about my business, but in a chatty sort of way. I explained I was in the business of selling and reselling mostly toys, collectibles, apparel, and electronics online for years, but recently put more focus on it and would like to grow my online sales, and to do that I need more inventory and a card to put those purchases on. He asked broadly what I’d be using the card for (inventory), what kind of expenses I expected every month (varies depending on market prices and trends, and my spending can be very seasonal). Asked if I’d do any shipping on the card, to which I said probably not because I have other Amex cards that do better on shipping, so I want to leverage the benefits of different Amex cards to earn better rewards back on my business. He was actually asking because he also wanted to pitch me the BGR that offers 3x MR on shipping. He read some disclosures, asked me the same questions as on the online application (so review that beforehand and have your numbers ready), then read more disclosures, and submitted the application. It was maybe a two minutes wait at most before I got the good news that I had been approved. While we were waiting on the decision, my rep took another opportunity to sell me the BGR and told me it had an offer of 75k MR/$10k/4 months, 1st year AF waived, and gave me his direct line to call when I’m ready for the BGR or any other cards. I got the sense through the whole thing that they very much wanted you to sign up for their cards. It was maybe an 18 minutes call in total, a lot of it disclosures and talking about card benefits. Don’t be nervous. Just get your story and numbers together, take a deep breath, and call. Good luck!
ETA: I have also applied for business cards under some contracting/consulting I’ve done, which may be more legitimate, but I haven’t done much of that this year. And my eBay sales are actually higher than any income from consulting work, so I’ve been going with my eBay business because it has bigger numbers and longer history.