Okay so earlier I came across a site that claimed that it's possible to get bitcoins for free by just; playing offline and online games, watching ads and videos, participating in airdrops and so on. They also recommended apps that give out bitcoin for free like coinbase.
This can indeed happen and indeed there are several platforms that provide Bitcoin prizes for a task. But the problem is the amount. Because sometimes, the number of Bitcoins is not worthy of us, even the nominal value is only very small. And of course this might end up in the cost of a transfer or transaction fee only. I agree with the opinion, it is possible to get Bitcoins for free on sites like you mentioned. But that doesn't make it worth the amount because the prize is worth it. Meanwhile, the platform that you are working on also has good returns because at least they get a lot of promotions at not too high a cost.
Something that is given away for free is most likely not worth the time. I don't recommend the OP to focus too much on getting bitcoin for free, it's just a waste of time. I tend to recommend it to gain a lot of knowledge about bitcoin
[technically or general knowledge] which can then be discussed in forums with the community. Of course the OP will have the opportunity to join signature campaign which also generates revenue from it.
I think it's more worth the time on this forum than looking for free bitcoin. But if the OP has the expertise then maybe he can get it with some other advice.