Now there are news about a possible increase in bitcoin supply; is it healthy for the space ?
Where did you get this news? there will be no addition to the supply limit of bitcoin. It will always be at the limit of 21 million. Regardless of how many lost bitcoins in circulation, I've never heard of something like that. If there's a link that you can provide about this, give the link to us.
Maybe he meant Bitcoin Halving to take place in the year 2020,
but the feedback the participants got right now was sad. many of them did not get paid and the estimates dropped dramatically
Yes many are unpaid and if they are paid almost none of the value of the token they receive. As a result, many bounty hunters have now stopped participating and others are still active in bounties.