Ask HN: How To Avoid Infringing Software Patents?

I try to build a non-profit dating platform and while researching different approaches to matching, I discovered that matching is indeed patented by the parent company of Tinder.

How can I, as a single developer, with no money avoid to get sued by a patent holder?

I think there is a good chance that my project is infringing multiple software patents just because there is no other way to do something, or it is just reasonable to do it this way. So another question would be how to find patents, since one have to know about a patent to avoid it, right?

Maybe I will just block US IPs and US phone numbers from registering, so I can't be sued for US patents.