I would say that not anytime is a good time to borrow bitcoin. But if you have that kind of reason on why you are borrowing bitcoin then that is going to be useful at all. Because you want to earn with bitcoin and that is going to give you good profit if you are going to borrow a lot. But the question is how you are going to pay that if you are just going to hold it.
And there is only a fixed time required and people must pay the debt. What if the bitcoin price increase people expecting out of their loan didn't happen on a term period.
The result? Wrecked! So better borrow if you will only use if for main purposes.
Its their lose if the price will go up or down its because the barrower will pay accordingly on how much amount of btc he barrowed the lender and it is part of consiquences since they didn't looking up for flactuation changes, and i don't think also barrower or lender thinking for that scenario since the lender will still earn for the little percent of the barrowers payments. But i don't see wrecking scenario on the part of lender or even in the barrower its because both manage the payments accordingly to terms and agreements of their deal.
No i think theres no equality to that state if the barrower doesn't give some collateral to the lender and suddenly flee, and theirs so many existing issue that scenario is happening in lending section so totally a big risk for barrowing some money is on lender, and surely they doesn't care about flactuation because mostly lenders doesn't have any TOS on that regarding to their service offered.