Presuming the above conversation is correct and the fault is "outside the TC network" but only affects TC customers, I would suggest that for most customers that is irrelevant and they may choose a different ISP where this is not an issue (depending on how deperate they are to watch cat videos and then comment).
If this supposition is correct and then becomes substantive, TC may need to consider their investment in the relationship they have with Google/Youtube.
Not that this investment will necessarily fix the problem, but generally I find that lots of broken stuff gets fixed by knowing the right person and having a good relationship with them. Ironically this is the kind of investment difficult to quantify in terms of ROI.
Jon




