1. Is this exploit done for selfish or general benefits?
Obviously it is.
2. Do you think Ordinals, Runes and BRC-20 will become a massive problem in the present and future?
Bitcoin developers allows it and they should know what they will do about it. If another bull market come, they will also still add to the blockchain congestion. We should have lower fee rate by now. So they are even a problem now.
3. should we focus more in resolving them or increasing block size instead?
Only bitcoin developers are the ones that can make this discussion and it is clear that they want the tokens to stay.
4. What's the answer to the topic title above?
Yes.