In regards to the question "would you classify borrowing money to invest in bitcoin as good debt or bad"... I would say a little bit of both. As there are so many risks involved, let's not forget the market volatility, that is at best one of the top concerns involved while investing in bitcoin.
I think most people will definitely not forget the volatility that exists in the market because they are already very aware of the risks before investing in Bitcoin. This is still a worry for some people who invest in Bitcoin, but we also need to see investors who remain calm when they invest in Bitcoin so that they don't even seem to panic when there is a price correction in Bitcoin.
Now in the hopes that Bitcoin will appreciate, it then turns out to be a good debt of one borrows money to invest in it. Some might also say playing it safe doesn't bring in any real cash. There's always a tendency for things to go south when it comes to investments regardless of where the investments are allocated. Bitcoin brings forth the possibilities of financial freedom but it also comes with a cost.
Everything has costs and risks, so everyone cannot deny this because they must first be well understood when they want to invest. Because Bitcoin is indeed able to bring financial freedom to everyone, but people who are only looking for security will not get more real money because they may still be very afraid of taking risks. So there is no real money that they can hope for other than just the security of the assets they already own and I think that is very natural because people who earn real money are people who are able to take risks after understanding the basic concepts for any risk.