I won't do it. My credit score is not even up to the level where anybody or bank will give me $50k credit  . Even if it is, I cant pay back if it fails so its a bad idea for me.

However, I feel that many people in the thread are making it sound worse than it is. There has to be context before giving suggestions in things like this.
First of all, do you have a means to pay back if the investment fails? If you invest in Bitcoin and it crashes, do you have a means (income from your job or business) to completely pay off the debt over time without wrecking your financial life?

Also, will the place you're getting the money from give you the loan for a long term? For most loans, you're required to start paying back within a year. We all know Bitcoin is a long-term investment. You have to leave it for 4-5 years. So, are you taking a long-term loan where you're not required to pay back for at least 5 years?

I don't think it's as bad as people make it sound. It's only bad if you don't have a backup plan. If you have nothing to fall back on if the plan fails, and you have to give up your house or business (what you used as collateral), then it's a bad idea, but if you have a way to pay back the loan if it fails, then it's not that bad.
If push comes tosholve, you can sell your bitcoin when its crashing, that way, even if you're at a loss, you wont be losing the whole $50k.