This issue really is not a huge deal in invite highlander, every sniper I have ever played against that did this was very killable, except maybe in the sightline from cp steel E spawn into wishbone/banana (in which they got stabbed for being immobile watching one angle my team wasn’t even pushing from). I can not speak for lower divisions, but experiencing this in invite has just been asking my soldier/spy/demoman/pyro with detonator/scout to help me deal with it.
It requires anyone on your team to do 35 damage on top of a bodyshot in quick succession, and if I avoid that one corner angle I can shoot their entire team without having to worry about getting counter sniped. I have yet to experience a crouch bug angle that engulfs the entire map, voiding all rotation (if there are, please show me). The rest of your team can then push the sniper from various angles, dislodging him as nabla previously mentioned above.
Now don’t get me wrong, it’s VERY lame and annoying to play against but it’s not the end all be all of a situation. For example, if their sniper is on offense and doing that to you on upward 3rd from house/lower main, just stop taking that fight, you can opt to just shoot cart or hold the corner from further back, which still allows you to shoot a combo pushing up the hill or to shoot players pushing catwalk.
For what it’s worth, no top sniper that I have played in 7s or highlander relies on this to win, because it is just svs cheese that can be avoided or countered.
Keep in mind this can be done entirely accidentally if you want to crouch peek an angle from the right side and end up too close to the wall. Would you ban snipers from peeking an angle too close to the wall to fix this? What about snipers and other classes sitting inside of sentry guns and dispensers? It also can be done from the left side too, just a lot harder and entirely dependent on how the map geometry works.
Clips from space ghost coffee’s stream a while ago showcasing the bug for those that don’t know: