Altcoins are said to be the alternative cryptocurrency aside from Bitcoin and many of the altcoins are decentralized and also centralized, unlike Bitcoin which is highly decentralized and out of the control of anyone be it.the developer or government Bitcoin has a total circulating supply.
None control it but when bitcoin came to the centralized exchange site hot wallet and this will become truly centralized as exchange site is having 100% control over the wallet.
But Altcoin is developed by individuals e.g Vitalik Buterin Ethereum developer and teams members who are known in the society and the source codes of the coin can easily be updated which have made them not to have a static circulating which is has been the major reason why the altcoin market is hard to speculate because it circulating supply can easily be tempered more coin being minted at will which will render speculators analysis inaccurate in most cases.
I think that who's developer has nothing to do with the speculation. Remember the as long as there will always be demand and supply and volatility will always there. It has nothing to do with the circulating supply. It's totally peg with demand and supply. This makes the market is very hard to be speculated as the demand and supply was always growing up or down instantly.
I think that that's the main reason why the altcoin market is very hard to speculate