Lately, I've seen a lot of giveaways (i.e. Apple products or cryptocurrency) to promote projects. I'm curious what the general (crypto) public thinks about this. I know a lot of the "marketing" side of cryptocurrencies revolves around airdrops and such and this can be controversial. But how about these giveaways?

Recently I participated in a giveaway for an iPad, instead of getting a raffle ticket or something, i had to sign up for the social accounts of this project. I did end up looking around, and i learned a lot about the project in the end, but  it got me thinking, does this actually add any value to the project if people are signing up and then leaving or does it make it all worth it when someone like me comes along and mentions it to a friend?

What do you guys think? And if you curious this is the link that started all of this.  https://cryptodisrupt.com/eterbase-ipad-giveaway/?cn-reloaded=1

[Sentigraph will be giving away 250 EMOT tokens to up to 5,000 participants.]

Sentigraph will be giving away 250 EMOT tokens to up to 5,000 participants.
Website: https://www.sentigraph.io/
Airdrop link: https://cryptodisrupt.com/sentigraph-airdrop/
Token type: ERC-20
Ticker: (EMOT)
Airdrop amount:  250 EMOT
 Sentigraph is a decentralized platform that provides useful insights to future events based on historical sentiment data of all participants.
Tokens (EMOT) on S3Pulse, Sentigraph’s platform, enable users to compute the Graph Index (GI) of a present or future events (Twitter hashtags is the current use case). The GI, represents the sentiment score or value of users’ reactions in a given event. EMOT can also be used to incentivize users to predict on the sentiment direction of a hashtag in the Emotion Volatility Prediction (EVP) offering 

[Mosaic is giving away 200 ETH of MZX in their airdrop.]

Mosaic is giving away 200 ETH of MZX in their airdrop.
Website: https://www.mosaic.io/
Social media:
Airdrop link: https://cryptodisrupt.com/mosaic-airdrop/
Token type: ERC-20
Ticker: (MZX)
Reward: 200 MZX
Description: Mosaic solves these problems by providing a database platform and decentralized market intelligence network with an intuitive user interface. We believe Mosaic will become the main crypto assets app—the gateway to the crypto world—where people get their data and research, discuss ideas with other members of the community, and manage their portfolios through the Mosaic meta-exchange.