Most of the times, they are alts. Anyway, once I was asked by one of my friend to send him little ETH for covering his fees. I sent but later I thought we both have accounts in bitcointalk and what if someone just links us as alt?
Then just prove that you sent him ETH for covering fees. Its not like that the feedback is not removable or is it?
Can't speak for others but I usually remove my feedback if someone has a solid proof that makes my connection invalid.
EDIT: Continuing my investigation
Daboy_Lyle uses telegram ID @lyledark10 here
#Join
Bitcointalk username : Daboy_Lyle
TELEGRAM AIRDROP : @lyledark10
FACEBOOK AIRDROP : lyledark10
TWITTER AIRDROP : @lyledark10
(Archive:
http://archive.fo/MGzE3#selection-3831.19-3831.30)
and same telegram ID was used by
lyledark10 here
$5 per sms. Contact me on telegram @lyledark10
(Archive:
http://archive.fo/UAESC)
Lyledark10 profile has been autobanned according to
https://bpip.org/profile.aspx?p=lyledark10 and hence he has been evading ban since then with Daboy_Lyle account. According to BPIP, he also sent merits to Daboy_Lyle account