> an option to block domains from which you don’t want to allow subscriptions.
This method of spam defence is pointless and you know it. Who is going to manually add domains to a blocklist each time they get spammed? The spammer is always one step ahead with auto-generated domain names, it’s a useless solution.
> we do honeypot checking
Much better than a blocklist but far from enough. Most spam bots can easily detect honeypot forms and bypass them.
> The above mentioned features provide essential immunity from spam
This is simply not true. Blocklists are useless and honeypots by themselves are not enough. Captcha + honeypot is a decent solution but you ensure your users have to pay for that. Why not offer the reCaptcha in the free version and the honeypot in the paid version? The answer is because reCaptcha is better, and you use that to profit from people needing access to this FREE Google provided service.
