All the other inequitous things pubcos do are worthy of highlighting but very difficult to prove as being endemic in the trade.

The tie is a contract but it has been manipulated to skew the balance of profitability away from tenants and brewers to benefit of essentially non essential go betweens - the pubcos.

The tie is a contract but it is an inequitous, anti competitive and anachronistic mode of business.

The tie is a contract which has been serially abused by pubcos to the detriment of all other parts of the pub trade.

The tie is a contract that has had its day...

It has been pointed out on this forum before that slavery was once legally supported world wide. At no point did that legal support make slavery an acceptable practice.