Is it worth it to buy channels with 4k ready hours?

Is it worth it to buy channels with 4k ready hours?

recently bought 3, two were refused to monetize and 1 approved

I paid 25 $ each with 4k hours

my question: to approve these channels, I used music clips to reach 1k of subscribers, since the channels already have 4k hours, after reaching 1k of subscribers, I deleted the clips, and put random videos from social networks like facebook. 2 more channels failed! my channels were disapproved for the videos I took on facebook or the video that had the public time of 4k?

Your channel will get demonitized if the subscription count reduces as well. You should make sure they don't drop.

I mean he was refused to monetize because I changed niche and I was losing some subs, from what I saw, when I bought it I had about 80 subs, then I uploaded the channel with a clip of many girls saying, after 1 month I already had 1300 subs, I deleted them all and put vlog videos on facebook, now I had 1190, I only lost 110 subs

Sristy said:

Your channel will get demonitized if the subscription count reduces as well. You should make sure they don't drop.

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Before monetizing you should be adding videos in your final niche and getting a decent amount of views and subscribers

This way your channel looks real to google and they won't have any reason to ban you