Nice way to communicate, the invitation to share some advice is a good thing to make people join sphere I think. With a little more add like that the number of users can grow nicely.
you need to create the "buzz", can be a good marketing strategies to acquire new users
I think maybe they should reward users that bring in new people with tokens. that would grow the community a lot.
I see rewards as the only reason people would bother to join sphere network because average doesn't care about their data and all.
There are a constantly increasing number of cyber crimes such as identity theft, private data theft etc., so I'd say people get more cautious. Maybe not all of them are aware about perks of decentralization, but getting rewards for managing your own data sounds like a good incentive to try and figure out what this new platform has to offer.