Building a business on blank cheques and accidental spends is shady. It's also a large barrier to adoption. The more times devs see reports like, "I tried [random 20-minute tutorial] and woke up to a bill for my life's savings and luckily support waived the fee this one time but next time they're coming for my house", the less they'll want to explore your offerings.
AWS prices are ridiculous. I pay OVH $18/mo for a 4-core, 32 GB RAM, 1 TB SSD dedicated server. The cheapest on AWS would be r6g.xlarge, which costs $145/mo. Almost 10x.
Yes, AWS hardware is usually better, but they give me 4 "vCPUs". OVH gives me 4 "real" CPU cores. There's a LOT of difference. E even if my processor is worse than AWS', I still prefer 4 real CPUs than virtual ones, which are overbooked by AWS and rarely give me 100% of their power.
OVH gives me 300 Mbit, while r6g.xlarge gives "up to" 10 Gbit. But still, 10x? 300 Mbit gives me ~37 mb/s. I use a CDN for large stuff: HTML, images, JS, anyways...
There are certainly cases where AWS is the go-to option, but I think it's a small minority where it actually makes sense.