Poor spelling shouts "limited resources and lack of professionalism" loud and clear. If you're asking people to trust you with their data and put time into profiles, you need to show that you're big and serious.
I don't use LinkedIn because it's the coolest kid on the block, I use it because I need to find people to hire, network with, and in the past I've needed it to find gigs and jobs.
I'm going to go where the most people are, and where I feel most confident that my data will be managed professionally.
I'm not going to jump ship for a startup just because LinkedIn is requiring me to opt out if I don't want my picture to appear near an ad. That's not Armageddon, it's just a minor, and ultimately inconsequential, annoyance.