For some. For me I go to a hiking or cooking event and I get 1-2 potential dates. There is a lot of noise on Tinder and similar, lots of people with interests too different from mine and lots of people that go there to just waste time. I realized the best way to find a partner was to do things I enjoyed with other people (meetup works well for this), I found my girlfriend 3-4 months after that "strategy" change.
I went through a Meetup phase (still an organizer of one) and went to a ton of meetups, met a lot of women, dated a few...but still ended up in a long term relationship with someone I met on an online dating site. Oops.
I still say going to those meetups made me much more comfortable talking to and getting to know women better, which probably allowed the relationship to progress to the point it has today (almost two and a half years now).
=> Bayes theorem wins