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Well, I think bot blocking is an obvious problem even now, and will be more important tomorrow with all private networks as you can imagine.

MOZ (and others) should find and implement the best possible solution, I see no problem with TAGFEE as soon as you are transparent with regards to the fact that your bots are undetectable.

I understand that what I'm proposing is maybe not best nor wanted solution, but the problem must be addressed or OSE will soon have no value at all

What do you propose ?

What about using different user agents and IPs regurarly in order to avoid detection ?

Is there any acceptable other solution ?

Some blackhat websites, PBNs and other "cheaters" are using various methods to effectively block third party backlink checker bots (OSE, Ahrefs, Majestic...) : robot.txt, IP and such.

A simple solution for those bots would be to mimic Google by using its user agent string for example.
Or if not legally permitted (which I doubt) use some kind of randomness in user agent strings, urls, and IPs in order to prevent blocking.

This should not be a big deal IMHO, am I missing something obvious ?