There were few users in 2010,Then the user started to grow slowly. now the increase in the number of users has become much more. The increase in the amount of spam is increased due to the increase of the user, Because of which everyone is dissatisfied. Now spammer is not finished with this. There are many problems in the future.Now, for a limited time, it would have been better to turn off a new account open and ban spammers. then again start open a new account system entirely.
See the following picture, how fast the user has emerged since 2010

In the year 2018, the user is overflow