Probably, but as far as I know I only gained 1k+ followers because I made it to the Top Posts for some of the popular hashtags and it doesn't always happen.
Wish I could hit explore for every post then I won't be needing my bot anymore. lol
So, I asked you and xCharged numerous times, if this couldn't be because you hit explore page - Do you now agree or not? I think that sounds most likely - It would be weird to me, if the people in your niche should be so much different than to mine, I mean the behavior as to look at the top post on a hashtag and decide to follow that account, it should be simply to reproduce for any niche. What is not simple to reproduce even for yourself is to get on the explore tab.
You didn't gain 1k+ because of the hashtag, but because you hit explore. And when you hit explore, it's most likely you hit all the tags as well. The other way around, hitting 80% of the tags, but not getting to explore, the gain is neglectable.
You can even hit explore without tags and gain massively.
I've some times forgotten to add tags and still received my average amount of likes, sometimes even more, so I agree on this. And this is also the reason why I know I don't gain anything from the tags. I mainly use the tags now as some sort of quick tool to see how my post do in general, with the account growing, it should be able to enter the top of the tags more easily and consistently, which is also what I see.