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Can't they be on both ? They could definitely add a token on Hive-engine and make it transferrable between the SPK network and Hive-engine.

Most people are more familiar with Hive-engine and it's WAYYY simpler to use.

true but a lot of people see limitations with Hive-engine and are building other platforms.
I feel they want to promote other DEX's right now. Maybe a HE bridge will come at some point.

I wonder how much it would cost to put 3.3 million NFTs on Hive Engine.

Bout $100 I guess

If you use PAL its pretty cheap 😅

But fungible tokens are only 50 bucks to make any amount.