BRRRR strategy Refinancing question

[Han Oo]

Hi all, I would like to ask about refinancing from BRRRR. Hypothetically, I buy the house at 50k. I rehab for 20k. So, I put 70k cash in this house. Now new valuation (ARV) becomes 100k. So, when I go and refinance and refinancing is 70% LTV or ARV. (Is LTV and ARV the same?). I should get back my 70k cash that I put down initially, right? That's how I understand. So, now when I ask the lender about the refinance, they said I can only get 25% of the new value and I need to keep 75% of the equity in the house.So, is that because of that particular lender or is that usual situation with the lenders? Does anyone has done that 70% cash out refinance before? May I know which lender do you use or how did you do that? Thank you so much. Respectfully, Han