The sharing economy is mainly utilized in the B2C & C2C market and not among B2B! Why do you think?

I have been researching a lot about the sharing economy and what is surprising to me, is that we mainly see the sharing-economy being utilized in the B2C and C2C, but not in the B2B! Why do you think this is? And do you know of companies/platforms that are focusing on the B2B market, and build around the sharing economy? Looking forward to any feedback! Thank you!