Like many other users, I periodically get spam notecards and IMs from SL business owners advertising their new products. I have NEVER signed up to any notecard mailing list, I have always been added automatically without my knowledge.
There's already a feedback post here about the ability to block these objects: https://feedback.secondlife.com/feature-requests/p/blocking-an-avatar-should-also-block-blacklist-all-of-their-rezzed-objects however I think that is only a band-aid solution.
Signing users up onto your "subscription" service without their consent should not be allowed in the first place. It falls under spam, yet every time I have submitted a report against these objects, & explained in the report that they are spamming me (and others) without my consent and sometimes without a way to opt out, nothing seems to come of it. So I can only assume that, currently, this isn't against the SL TOS, or for some reason the reports are falling on deaf ears.
Every time this has happened to me, the ads I get are from a brand that I don't recognize. This is because every time this happens it's nearly always happens one of two ways:
  • I was added to the mailing list because I bought ONE item from the store in question; often a long time ago, sometimes years or more, from the Marketplace. This implies that the store owner is manually adding all Marketplace customer usernames to a mailing list or automating the process somehow.
  • I visited the sim one time, and my mere presence was enough to get me on their mailing list.
I need to stress that not only do these users add you to lists extremely easily, but they often make unsubscribing very difficult. At best, it'll be through a system like "KioskNet" - which at least has an inworld location you can go and get a HUD from, and unsubscribe from any mailing lists using that system.
But if they use their own system, you're often out of luck. Some tell you "unsubscribe in the mainstore" but when you go there, there's no unsubscribe button, no matter how you look. Others say "contact me to unsubscribe", meaning that you have to actually talk to the person to convince them to take you off.
And even if you find a way to unsubscribe, some will automatically put you back on their list later! I periodically check the KioskNet thing because every 6 months or so, a store has added me back as a "subscriber."
As the other thread on this issue says, though, blocking either the user or their mailing object usually doesn't work because they tend to rezz multiple copies of the object, and keep going. Once you're in their system, you will be contacted by any object they rez going forward.
I ask that Linden Labs considering making these unprompted spam subscriptions disallowed on the platform, and actually punishable. You should ONLY be able to get a "subscription" by opting in. Intrusive ads we did not ask for are spammy, disruptive, and extremely annoying.