I'm still pretty new to riding bikes as a adult, but wanted to share my experience in hopes it helps folks:
Im 6' 330 lbs and ended up getting an aventon aventure eMTB. It's held up well over the 400 miles I put on it, but I definitely notice the brakes going quicker than advertised with all the hills near me and my size. I'm sure it won't last forever, but I'm expecting to get under $1 of initial cost per mile ridden, which felt worth it to me as a 2nd car alternative.
I've been looking into a company called Clydesdale also to plan for bike 2.0 in a few years. They advertise titanium framed bikes made for very tall folks. I never used them myself, but they may be a good option for folks willing to pay 5k for a bike.