In my experience they've been tinkering a little more frequently recently, as they are trying to shake the bot users.
The hope is that if they become enough of a pain people will quit, and then they can mop up the residule quite easily.
It's part of the nature of the game, it's always cat and mouse, and you have these phases where people try to purge the BH community.
In the end THEY have no solution, that was shown last time, and they paid a heavy price for it, what ever system they implement a solution will be found, so the 'problems' will never go away.
They know that, experienced players know that, but they are banking on enough people not knowing to ease the 'problem' to a degree.
When these things happen your best solution is just to ride it out, sooner or later it will be bussiness as usual again, fewer tinkerings, and back to normal.
It really is just a 'game'.
It's the same with any site that you 'hit', you'll get the same 'games' played from time to time, with the same outcome, someone will always find a work around, and then it's back to normal.
There are no easy solutions, people who think that BH is all about easy solutions are mistaken, it's still 'work', you still have to put the hours in, you still have to use your head, and play the 'game', the only difference is you're using your brain to shave a few points off the odds, so to work things more in your favour.
You can get richer, by being smarter, you can get their faster, by cutting corners, but you don't get anywhere by doing nothing.
Whatever YouTube implements, it's just a case of working the angle that gets you back in the box seat.