I actually used a .tk domain for a forum for some university friends when I was still busy with my studies. It worked well enough and was free, however I was a

I actually used a .tk domain for a forum for some university friends when I was still busy with my studies. It worked well enough and was free, however I was asked for money to renew the supposedly free domain. That's when I decided that it's easier for me to just manage my domains with NameCheap or another solution where I already had some other paid domains (maybe to just put the forum under a subdomain of one of those). Apart from the .tk domains being free at the time, there was nothing else going for the platform in my eyes. Note that I did pay for a year for that particular domain because it was cheap, so the transition would be smoother - a redirect at the web server level, where is you open the site through the old domain, you're redirected to the new one.