I think the answer to that question by the therealwolf is really pretty simple, though I think some of the things you touched on are probably true as well. The reason LEO has been able to attract liquidity on Uniswap is two fold:
There is no other option for trading LEO (outside of very thinly trading hive-engine), LEO is not listed on other exchanges like HIVE is. LEO needs Uniswap while HIVE does not. If LEO were to be listed on many other exchanges like HIVE is there wouldn't be the need for the Uniswap pool for LEO either.
There is a reward incentive for people to provide liquidity with LEO. People collect part of the LEO inflation for providing liquidity while the people who provide liquidity with HIVE suffer as inflation rolls out day after day that their coins are not taking part in.
Regarding HIVE, I think one of the reasons HIVE is struggling so much is the DAO. We have thousands of dollars being paid out via the DAO every single day which eventually gets turned into HIVE. There simply isn't enough demand currently to offset the amount of money flowing out on a daily basis. That could easily change with a surge in demand, but for the last several months that surge hasn't come and it's a big reason the price of HIVE continues to drift lower.
We could say this is true for the last several year.
Without a doubt, the lack of growth is causing a host of problems. Most entities, when there is tremendous growth, some of the fundamental problems are taken care of. Certainly, there are other issues that arise but what people were fretting about seems to disappear.
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