Why DO storage optimized droplets expensive compared to AWS, GCP?

I was comparing DO storage optimized droplet largest instance to AWS, GCP counterparts which you can see below.

DO storage optimized droplet

• Memory : 256GB
• CPUs : 32 vCPUs
• Storage : 7.03TB SSD
• Net interface speed : probably 2 GB/s
• Data Transfer Out: 10TB
• Cost / mo = $ 2,480

AWS

Instance Name : i3.x8large

• Memory : 244 GB
• CPUs : 32 vCPUs
• Storage : 4 x 1900 NVMe SSD = 7.6 TB
• Net interface speed :10 Gigabit
• Data transfer out : 10 TB
• Cost / mo = $ 2,388.62 (1 year no upfront reserve)

GCP

Instance type : n2-highmem-32

• Memory : 256 GB
• CPUs : 32 vCPUs
• Storage : 24 x 375 SSD = 9 TB
• Net interface speed : 7 GBs to the internet
• Data transfer out : 10 TB (standard tier)
• Cost / mo = $ 2,168.08 (1 year commitment)

As you can see DO storage optimized droplet is expensive compared to GCP, AWS instances. If you go with same AWS instance with 1 year full or partial upfront reserve things get more cheaper. I expected DO to be cheaper compared to AWS and GCP. Am I missing something here?

Another problem I see with DO droplets is network interface speed.