Many people became interested in crypto after the bullrun start, many people want to earn money after they had heard about bitcoin growth. I don`t think it`s a good index, but new people come to crypto and it can help make crypto more popular and demanded
Raise of the market attracts a lot of people to the cryptocurrency industry, but for profitable investmen it is necessary to have knowledge and experience. If person does not have knowledge there are also professional investments funds like
https://defiscale.io/ which invest money in gambling and finance and pays a stable income to investors.
Don't know, I am sure that there were some people who had money available to be thrown at cryptocurrencies even though they didn't really have a clue what they are doing. Some of them took profit big time, I am sure about that. Just timing and luck and enough money to not being forced to sell.