

Yup. There are a handful of useful coins, and a handful of legit exchanges. Hold your own keys in FOSS wallets, keep backups of your keys, and don’t expect to get rich quick (and instead find a use outside of investing). Do that, and you should be fine.
I’m super interested in privacy coins like Monero, so I go out of my way to find merchants that accept it. It’s reasonably stable, has very low transaction fees, and it’s fairly popular among privacy advocates, so I doubt it’ll go away anytime soon. That said, I only keep what I’ll spend, so make a couple hundred at a time.
No, they responded to your argument that crypto uses tons of electricity, and responded that the one they use, Monero, doesn’t do that. Then later responded and said they pay bills with it.
What more do you want?
There are a number of services that take crypto, such as:
Btw, all of those take Monero. If you look, you’ll find more.