I've just upgraded to Big-Y on FTDNA and have joined several projects. I have one close-ish match in the US. The only person with my terminal Y-DNA group. When I looked into it further the link is probably 20 generations ago with the branch being formed about 490 years ago, around 1500 CE.
There is definitely a US bias, but I understand that over time, I can expect more DNA matches. I've come to realise that the Y-DNA aspect is much more to do with origins rather than genealogy. You can upload your autosomal DNA to the site. Some groups also raise funds and may sponsor someone to get tested. Gedmatch is another site you can upload autosomal DNA to.
I guess you really need to think about what you hope to get from joining a project on FTDNA. There are many Facebook Genealogy groups you could also consider joining whether for a Y-DNA or mtDNA group or for a family name.
By the time you go back a few hundred years many of the contributors Ancestors are from Britain or Ireland, I don't think a U.S bias is that big of a deal. Haplogroup testing is taking you back 200,000 years.
I think where it comes into it's own is when you have broken direct lines. For example, my 5 x great grandmother was a woman who suffered dreadful tragedy, she married a William Jordan in 1785 and they had 7 children together. By the time my Ancestor Ann Jordan was in her early 30's she had buried 5 of her 7 children and her husband had died leaving her a widow with 2 children, one of which also died as a little boy.
Three years after her husband died she had my 4 x great grandfather 'Squire' and he was given her married name.
This was quite a surprise, my father laid great store by our Ancestral name 'Jordan' and we actually had no connection to it at all, not even down the maternal line.
Anyway, I found out about haplogroup testing and the surname projects so I signed my brother up. It is unfortunate that basic testing doesn't actually don't get heaps of information about your haplogroup subclade...just the basic haplogroup and if it's the common R1b they give you M269 as well, but that is shared by 110,000,000 in Western Europe. At Y67 markers you can put the codes you get into something called NevGen and it predicts your haplogroup subclade, unfortunately mine is pretty obscure so I didn't get a worthwhile prediction till I put in 111 markers. Still, Y67 would probably do for most people and it's much cheaper than the big Y project.
We seem to be in the same group as hundreds of Scots and Irish men, plus a fair few in England but they are all one step away from us, not sure exactly what implication that has but we are the same away from men in Southern and Northern Europe and everywhere in between so not close. I think the back story may be interesting even if we don't retrieve the correct surname.