decent read. i am still getting to grips with all things blockchain, bit i think i agree with may of the responses already - BTC and maybe ETH have become like real money, and people only want to gamble with real money. So any other "altcoin" blockchain projects have two options:

1. allow betting with BTC or ETH
pro: this is what people want (real money betting)
con: what is the altcoin token for then? what 'job' does it do and why would it appreciate in value?

2. allow betting with your altcoin
pro: ?
con: why bet with what is really just play money?

i don't really know much about funfair or edgeless, so can't comment on them directly, but the above is my general take.