Only AMD execs truly knows but I think there might be two factors involved. They really want to attract new customers and build echo system and the second part is hard when everyone has been buying almost entirely intel. The second is their cost for such a cheap should be enormously cheaper than intel because of chiplet design. A single chip die for the intel chip is way bigger and yield and cost dramatically increases as die size gets bigger from what I read. So at same profit margin AMD chips would be cheaper and to gain the market share they are probably willing to lower their profit too so those two element adds up.