Plenty of Fish is a canadian dating site which is very popular primarily in Canada.
and in other countries also like the united kingdom, Ireland, Newzealand, brazil, and the US. And the plus point of this app is that it is in almost 9 languages.
This company is based in vancouver, BC,it generates revenue through advertising and premium memberships of the account.
Plenty of fish is available as app in both iPhone and android.

Reference Link: https://www.usatechblog.com/blog/delete-pof-account/