That's true you can see many altcoins become $0 and looks dead because there's no development on the project. Bitconnect is only one of them, if you want to see you can look another dead coin you can find at
https://deadcoins.com/.
That's why some project are now locking their token for about 6months to avoid been dump and fade out in volume easily. Poor bitconnect that it has no single volume again