I would dare disagree that doing Bounties will give free altcoins as you would need to advertise ICOs for a period of time and it take time and a bit of knowledge to do so. Also for Hodl you can there are only two ways that you can do it, either by buying altcoins that has a potential to multiply its price in a period of time or doing bounties then after you got your coins sell it when the price hit a moon. The only way you can get a free altcoin is via Airdops however sometime most of the would require you to refer someone to get more tokens. Also Telegram groups do have quizzes and airdrops that are posted regularly but do be wary that only a few of the airdrops can be profitable.