If I had a big win on the lottery (so that I'd got some money to 'play with, where it wouldn't matter too much if I lost it) I'd most definitely look at investing in one or more cryptocurrencies. However I'd probably go for one of the newer ones, such as Litecoin:
https://www.techadvisor.co.uk/feature/tech-industry/best-alternatives-bitcoin-10-cryptocurrencies-watch-in-2018-3671141/
Spath:
They're not only used for dodgy dealings. Many 'mainstream' traders, such as Microsoft and Expedia, now accept bitcoin payments. Further, some businesses are now turning away from accepting debit/credit cards, which incur hefty banking charges, in favour of accepting cryptocurrencies. e.g. the Pembury Tavern in London doesn't take cards but it does accept both Bitcoin and Litecoin payments.