Here's where SPAC's make sense:

If you take the old school mentality that an IPO is a financing mechanism, and not a liquidity mechanism, a SPAC is ideal for Cleantech. A SPAC IPO provides access to funding to take a clean energy innovation to scale; this is far beyond the time/patience window of VC's and even the most patient corporate investors. SPAC's therefore are one of the BEST ways to solve the duration problem pointed out in the paper published in collaboration with Dr. Ben Gaddy a few years back:

https://papers.ssrn.com/sol3/papers.cfm?abstract_id=2788919

For more on SPAC's and CleanTech read here:

https://climatetechvc.substack.com/p/-the-state-of-climate-tech-vc-and