Proposal 7101 has already passed, which is essentially the same as the proposal description in this proposal discussion. Here is the discussion for that proposal that has passed.
As a result of that proposal, the following pull request was put in and merged into the Terra Station code at the time:
This code was also pulled into Rebel Station as well (and any other classic-station code that was forked and updated to pull in that request or pulled afterwards).
The same developer has also put in a pull request for the new Interchain Station as well - with even more robust pattern matching (it has yet to be merged however):
Since there are now more than one L2 wallet (that allows for governance) for people to use to connect to, anything further than what has been done would need to be done at the L1 layer with a parameter change for the official discussion forum site (for the situation where it changes). But, while a L1 solution would make things consistent and robust across the board, even for cli, and in non-Station wallets that offer governance interaction, I am not sure how much more it will gain in spam reduction (although personally I support it if it will legitimately actually help, and does not infringe on legitimate governance). PR 122 made sure that only the forum discussion link was clickable on Terra Station and other versions based on Terra Station that incorporated the code - all other links that would have been clickable are hidden by default - although PR 202 does attempt to catch situations with non-clickable links while also not catching legitimate proposal text.
Just some thoughts if they are helpful.
I hope that helps a little bit, and that you have a great day 