Don't focus on the number of free tokens but check how the progress of the project itself.
1. Is this token already listed on an exchange? (trust-able exchange or not)
2. How is the current result of the fundraising? soft-cap or not? (be careful, it can be manipulated)
3. What the team members plan to keep the token price at a good rate? (it must be specific, clear enough, & reasonable)
You must learn carefully at least 3 points above. I think you don't want to collect a worthless coin, right? Never think to join if you doubt about the future of that token. I say this because I have joined many free tokens and got nothing till now.
*By the way, I guess the price will be dumped so easily because of too many bonuses. You can imagine how many tokens will be earned by people. If most of them want to sell at the same time, then the price will be dumped soon because of too many supplies than demands. And you probably got almost nothing as too low price.