Whether it’s based on actual claim and financial impact data, or a bias against certain breeds, anything that can void a policy opens the policy holder up to losing everything.

If you are buying existing notes then you are subject to the arrangement already in place (which usually means you as the note holder pays the fee). 

We can't control how Fundrise does business, so if they are sloppy(unlikely I know) then is it possible for the veil to be pierced and  the personal assets of individual unit holders exposed?

While not typical on every deal, there are transactions where the Buy Full Sell Short strategy can be used to retain future or tail-end payments.This technique is based on your purchase of the full payment stream from the note holder/seller with the resale of a shorter payment stream or partial to an investor.This enables you to earn a fee on the initial sale of the partial to the investor AND keep a portion of the future payment stream.

The big bank mortgage holders (Chase / Guild) for my primary and rentals either don't do HELOC's or denied me due to debt/income being too high. 

They push developers away and long term holders of RE can still benefit. 

How would taking them and trying to sell them to a portfolio holder that may need some negative profits to balance out their portfolio sound?

Current owners are either long-time holders or burning funds to cash in on appreciation.I would suggest looking outside the immediate area, probably towards the east and/or south-east.

As an ex Angel season ticket holder and a life long Dodger fan, I'm also sad.

Most landlords waive deposits for section 8 holders to try and gain a competitive edge in certain markets.