Answer:
1. 1. New coins usually don't give a lot of confidence, but sometimes very good projects come out, and the future is bright, and here you've only said the technology of blockchain,, but iota ''tangle'' technology now has coins with different networks like hydro and holochain.

2. let's give a different answer, now bitcoin has a negative impact on the whole market.

3.  I can say that most of the icos in the last 2 years have no use.