I do not support this change suggested because:
1) Most of these threads that look spam to you are made by new members who have very less knowledge about bitcoins and crypto. They are just asking their doubts which look funny to an experienced person.
2) Some members may be joining just to ask some questions here, if you restrict it from this, they will move to other platforms like Quora.
3) There is already a report to moderator option present on all options and you can use it if you find someone ding this repeatedly with wrong intentions.