Very big? More than half of the trading volume displayed in the CMC falls on the Yobit exchange. You should not trust the data in this exchange. Although the volumes grew slightly, against the background of volumes last winter, it looks unconvincing.

The price of cryptocurrency is very volatility and it depends a lot from the market conditions. That is why stablecoins are so popular.

I think that if the control on centralized exchanges will become more strict decentralized exchanges will become more popular.

This is not true in every case. They can burn a large number of assets. The speed of issuing new assets due to LPoS can be slow. Thus, the price is temporarily saved.

The development of the project is very important for every investors. If investors see the development they start to trust the project and hold the tokens.

If the project is interesting for the user and has practical application, it will always develop.

Listing on exchanges costs a lot of money. It is very good that the project is developing and adds new listing. It will help to the worldwide development of the project.

Sometimes increase of the price when market falls can means the market manipulations. But market manipulations cannot last a long time. If price increase for a long time it means that the demand in the tokens grows.

Large companies have become so, because at the time they introduced something new. They can afford to analyze the relevance of the blockchain. Yes, in some cases, blockchain can be useful.
But this advantage is sometimes exaggerated. This proves a large number of crypto startups where blockchain is not needed. Such startups were created during crypto hype to make it easier to rise money by crowdfunding.

I think that EDC blockchain use enough promotion and it organized a lot of events for growing the community of the project.

Why not? If many people use at least one coin in a certain wallet, this may be enough to create a large turnover and profit from commissions. At the same time, there may be 1000 coins in the wallet, but if no one uses this wallet, then there will be no profit.

EDC Blockhain is developing very quickly. There are a lot of events and meetups. The community grows and volumes of trade are very big.

A lot of depends how usefull is the project. Sometimes people sell tokens just to get some money. If project is not usefull the price of the tokens can be very small.

One of the most important thing is capitalization of cryptocurrency. But the trading volumes are very important too.

Reputation and liking/trading preferences are two different things.
Maybe I would like to trade on these exchanges. But it is unlikely that I will, knowing the reputation of these exchanges.

Besides exchanges there are also exchangers. So in all cases it is very simple to exchange EDC and it is not necessary to have special knowledge and be experiecne crypto user.