I recently got approved for a 250K MR offer for a Business Platinum card with a 250k MR sign up bonus, with a $20k spend. In the portal when I create the referral link, it says "Friend could earn 150,000", but my wife saw 200,000 when she tried it out. I bet if you try it a few times and/or using incognito mode, you might be able to get 250,000. Please give it a try if you're looking for a new card:
https://americanexpress.com/en-us/referral/business-platinum-charge-card?ref=JEFFRRHIha&XLINK=MYCP
Thanks for sharing the link Dr but all I got was 150K for $20K in several attempts both normal Chrome and incognito.