This whole conversation is exactly why I dumped my broom after the rules change.
Many people said, including here and FGI...RIP, simply change to un-anchored or screw them and stay anchored. No biggie....people said, to use it anchored and certainly un-anchored. WRONG!!!
My response, someone will still say something which would piss the s*it out of me knowing I had practiced my a** off to do it the "legal" way. My bet is it would be someone not knowing the rule and questioning using a broom period.
So I now use a conventional putter, even though I can't practice like I desire due to back issues.
I thought about creating my own broom with the most ultimate perimeter weighted putter possible, a Cure, just to piss some people off and have a massively forgiving putter with so much weight it would literally swing itself. This would make it even easier to use IMHO with an obviously and indisputable un-anchored stroke. However, it is not worth the time, effort and $$$$.
So it is Langer and also the amateur at this years Masters under scrutiny. Not surprising as it was only a matter of time.
I would be shocked if the other players allowed him / Langer to take money from their pockets using an "illegal" stroke.