Changing the order of your points a bit for clarity..
Well, this one is obvious bullshit: date LOOKS similar, but coinsmarkets.com was registered on march, 9th, 2017, and electraproject.org was registered on september 3th, 2017 - so each time a nine and a tree - in month and date, but just half a year apart... Coinsmarkets was up and running long before the actual Electra-Team started to get formed, and the web-domain registered. (And yes, I look at the above links, that's where I get the DIFFERENT DATES from...
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2) now I understand why other big markets(yobit,nextexchange and others) doesn't want take this coin ,because they feeling sometging not clear and wrong.
Ha,Ha,Ha..
next.exchange is not even up and running, so to call it a big exchange seems a bit premature, but Electra is still on the list of the coins that will be listed from the start --> see next.exchange website...
And then there is Yobit - Yobit is up and running, and you can find (an non working) Electra/BTC market since about 2 weeks, with buy orders... Problem is - if you want to deposit, Yobit says since two weeks: "deposits for such currency are temporary offline". (So there can't be sell orders, because no one can send Electra to Yobit.).
Now, this is a typical Yobit problem, you can find dozens of coins where devs and community are complaining because Yobit doesn't answer their tickets, doesn't include mandatory wallet-updates, remains on the wrong chain after a hardfork for years, and yes, you can also find many "coins" that don't even exist anymore, because the chain died years ago, no devs, no community, but still trade (but- of course - no deposit and withdrawal) on Yobit. They rarely ever care if a wallet of a non major coin is online or syncing properly. So - may be - once they installed the Electra-Wallet, it took more than 10 minutes to download the entire Blockchain, so Yobit just gave up - and kept the monney. (May be they will look in a few weeks if they now have an active wallet - but hey, that would be the usual level of support you get from Yobit...). Yobit doesn't care about quality... So to claim that the fact that ECA are still not actively traded on Yobit because of quality is just ridiculous...
I, personally, would never have suggested to apply to Yobit...
5) possible that coinhouse and crypto-bridge own by them too.
Unlikely with coinhouse, they just showed up a few days before coinsmarkets went belly up, and benefited from it, but they didn't list a large number of coins that got "orphaned" by Coinsmarkets (or Nova-Exchange, for that matter), and quite a few coins with very low volume, that you could get at Bittrex et all. (and therefore not generating a big demand on a minor new exchange.
Definitely not with Crypto-Bridge - (Crypto-Bridge is a decentralized Exchange with a own Blockchain, trading coins as tokens on their chain..) Unfortunately, I must admit, as much as I like Electra, creating a decentralized exchange seems way over the head of the existing dev-team, especially months ago...