Or is it a crypto that will one day be reliable with a good future

is it a standalone crypto that has not been launched on ethereum?
Don't you remember EOS?
EOS was just a piece of paper, no mainnet, no nothing, just a token and a piece of paper.
It gathered 5 billion USD in the ICO and when to top 10 in day 1.
Is EOS a scam? Doesn't look like to be a scam. Is it a good project? Not in my opinion.
What about Polkdot?
There are a lot of eyes in it a now. Certainly it is not the best time to get in. Is it a scam? Unlikely. Is it a good project? Unlikely as well.