Blockchain crypto coins , as long as they are not placed in someone else's wallet, is placed in your own wallet.
if the official website had closed.
The coin is still in,
If the website is also a decentralized Blockchain crypto,
yes or no that website will not closed?
So wish website is like BTC is Blockchain crypto with not closed.
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In that case @cloudblade, you can have your own wallet that is not on a website to keep it safe! Hope that answered it.
Have you had problems with those websites?
Bitcoin has done it everywhere...
But online website does not, many plus crypto currency must rely on the existence of the website to be valuable, but the online website often closed by officer, so if the online website also uses the blockchain technology (like as BTC), it must be more reassuring.
Thank you for sharing @cloudblade, need to always be wary of scams on these websites.