I have seen this channel for long time and I jhave noticed gradual increase but suddenly last week it bumbed and reached 50k within 7 days. I am sure they are using some service ,kindly let m know any one how come this is possible ?
https://www.youtube.com/channel/UCiWNdEwiMv6FgQRdeXeD5DQ
Analytics:
https://www.youtube.com/channel/UCiWNdEwiMv6FgQRdeXeD5DQ
Analytics: