When I try to login using my iPhone through LinkedIn internal browser.

It’s urgent doesn’t require login to RSVP and participate of the events like MongoDB User Group.

When I open the subscription to the events and use only MongoDB RSVP are too low (around 20~30% compared to Google Forms (no login, just click, fill and done)).

There are many ways to avoid BOTs and similar, require login it's not a good one to bring the community to close.