Do not purchase the Designguru's "Grokking Lifetime" subscription

I purchased the design guru's lifetime subscription a few months back. A lot of their courses are extremely mediocre. They don't put much effort into building their courses. I feel like they just "copy paste" information from other places. I purchased their lifetime subscription because their system design course has good reviews. So assumed the other courses would be good too. They wont even provide refunds even if you ask for it immediately after purchasing the course. That itself gave me a feeling it was shady. Also all their courses have a rating above 4, which is very suspicious given the quality. The only positive is, it is structured. But I do not think it is worth paying hundreds of dollars just for that.