Welcome aboard, Teoras. Just be glad you don't have to pay a fee to register
But seriously, here's the bigger picture: to keep a venture like Subsim online for 21 years, there has to be participation. There would be no forum or mods or effort by the moderators to keep spam out if people declined to post, discuss and occasionally donate. Without a "requirement" to register, and the necessity of posting, 97% of the people would be drive-bys, just loading up mods and not helping or giving back in any way. And in that scenario, the whole enterprise would fail.