Lawyers in Silicon Valley strongly support a jobs bill making its way through Congress that would make it easier for small companies to raise capital and go public.

But their enthusiasm is measured. They warn that a controversial “crowdfunding” provision in the so-called JOBS Act is fraught with risks, including a possible flood of securities litigation. And even if the bill becomes law, they say they’ll continue to advise startup clients that crowdfunding is a last resort for raising capital.