I'm ok 2fa, as long as it's not Mandatory.
This isn't a banking app.

Sorry @robin, you got a down vote because your thinking of making this Mandatory.

I understand that you want to secure pinside, but this isn't the way to do it
If you want to secure the market place, add mandatory 2fa there
Do not add it for general usage

Again ... Pinside is not a financial institution... 2fa is more than an inconvenient bridge to far

Like I said... Remove the area which entices these people.

Having the ability to post with a hacked account isn't a security risk.

Having the ability to post an ad in the market place, sure.