I'm extremely sceptical about this Manuela Fundácion deal and hope GreenEdge have done their work vetting the buyer/sponsor. There's nothing on Francis Huertas public life and known business activity that suggests he has the clout to take on a challenge of these dimensions. In fact, quite the opposite.
As for the question, also find dubious that road cycling sponsorship offers a good return to any firms, big or smaller, except those in the field like bike and parts manufacturer, apparel, supplement brands, etc. That's why an overwhelming percentage of team sponsorship money comes from firms lead/owned by road cycling enthusiasts (with the personal intangible benefit of owning a cycling team being an obvious powerful motivation and overriding concerns about firm related returns) and organizations ran on taxpayers money (and hybrids, like the current Gulf monarchies sponsorships). Even for those fairly successful sponsors like Quickstep and Bora, my assumption would be far larger returns via targeted marketing. But of course, I haven't done any math whatsoever and scoring the return of sports sponsorship investment is more of an art than a science - and a lot depends on things beyond metrics like cost per reach, like how effective is the activation (promoting the sponsorship) or how valuable is brand awareness increase for each firm. But cycling fans are relatively few, oldish, poorish... Anyway, I don't know, and don't think firm size is a critical factor, just wanted to comment on that Manuela Fundácion thingy - finding the whole affair quite odd.
Yes, I find it odd, too. But then that's what I think about most sponsors - often they are just not the ones that I would expect, hence this thread.
I think indeed the average cycling fan is rather old than young, about poorish I'm not sure. I think they are very middle class.
In Germany there is a company "Kind", selling hearing devices. The guy invests a lot in one of our football clubs. He's not the kind of guy you would like to work with, but would that not be a good sponsor for cycling (considering the age structure...

)?
Someone I would really like to see investing in cycling is Dietmar Hopp, one of the founders of SAP. He's a patron of the TSG Hoffenheim, investing a lot in sports/ development of sports, he's incredibly rich and seems like a "good guy", although a lot of football fans hate him (in fact he gets threatened a lot because of his investments). But he's interested in a lot of social topics, also climate change, and isn't shy in donating. His sons are leading one of biggest ice hockey clubs in G and a golf resort. But cycling does not seem to be on the agenda of someone like him.
Okay, in the end we don't want patrons, but real sponsors, right? But obviously the benefit for the companies is not really there, otherwise cycling would not have these immense difficulties to find sponsors that don't do it for "personal love". Which I still don't get because even if the effect is not very targeted and in countries not called Belgium or Colombia people may only watch the Tour or the other GTs, the money they have to spend to
name a team is ridiculous for a big company. Adidas had a marketing budget of 3 billion euro in 2019.
In these times I would have thought Sunweb might withdraw, but now it seems they are one of the most reliable sponsors!