Cash App is a public company and has deep pockets though. Strike is a startup fighting for survival.
Here is the nostr:npub1cashappn03s3cl2ljsdntv0v28e2um5lgx4vjctqjt23pcwzjhsqmtdg5l example ! Seems like fair and still in business. I guess River also does the same as cashapp following the network fees model 
Cash App is a public company and has deep pockets though. Strike is a startup fighting for survival.