That's just because i can't set different nameservers by myself?
Or does it can't generate a revenue being a "borrowed" domain? (i don't know nothing about how this .tk stuff works)
the free .tk domains dont allow you to have dns. they only allow url forwarding. so no you can not park them. however if you had a paid .tk then it would be possible.
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So if my tk domain traffic is of - let's say - football lovers, i can just redirect all hits from my .tk page to a .com domain parked with football ads, right?
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"Dear Jacopo,
I'm afraid you cannot do this as it manipulates the traffic figures for the domain. This can be especially problematic if the domain is listed for sale with us, in which case the traffic statistics provide the domain's traffic figures."