Bitcoin has the highest probability of surviving any major event to to its community adoption.  I have to say, Ethereum is looking more so like its getting close to that point-hence a lot of the existing coins would't even exist without ETH.

If you are getting the tokens at a discount then yes, you should sell once it hits secondary markets.  This is dependent on the quality of the token you are getting.

The fake telegram groups are for sure real.  How can you organically create a telegram channel with 25k people in a week? Makes no sense.