NEW YORK (TheStreet) -- Segments of companies as "old" as Amazon.com (AMZN) - Get Report and Ford (F) - Get Report operate as start-ups.

While Amazon functions in "perpetual start-up" mode, attacking growth opportunities with a focus on revenue and reinvestment, Ford runs largely traditional, bringing

more of a start-up feel to divisions such as Sync

.

Number of years since founding, private or public -- none of these things play much of a role in designating status. It's about attitude, mentality and culture.

You pretty much have to succumb to some regular corporate structure -- relatively stodgy human resources and payroll departments for example -- but, where the magic happens -- in programming, products, services, development, content, whatever you do -- there's no reason to ever lose the fire.

In my admittedly narrow view, the best companies remain in start-up mode forever. But this doesn't prohibit them from being profitable. Losing money is certainly not a prerequisite for start-up status.

It's almost certain to happen early, often and quite possibly as you mature and hit growth spurts and growing pains. It's all about how you manage the process.

Because a great management team runs an equally as awesome business, Amazon will never need to find a buyer. Not like

Zipcar

(ZIP)

. By all accounts,

Zipcar had no choice but to sell out

. That makes cries that you'll never patronize them again well-intentioned, but just as asinine as vowing to stop listening to

Greenday

because they traded Bay Area clubs for international arenas and stadiums.

Hating on big corporations like Sarah Lacy did over at

PandoDaily

is not even

so 2012

. It's

very 1990 let's go protest the Gulf War in front of the Chevron Building

.

So Zip went down. And, to a certain extent, that does suck. But who cares who signs the checks? Zipcar will be Zipcar. Just like my favorite bank --

ING Direct

-- will remain better than the alternative even after getting taken out by

Capital One

(COF) - Get Report

.

It's cold hard reality. Some companies will just never be able to persist on their own. If you want the concept of car sharing to exist, at least as Zipcar organized it, you better hope a company with cash steps up.

When you approach the notion of start-ups and M&A using my lens,

Netflix

(NFLX) - Get Report

becomes the next one to fall. Carl Icahn knows this, which is one reason why he decided

to give Reed Hastings a little hell

. Hastings responded, not surprisingly, by making it more difficult for Icahn to make a move; however, the Netflix CEO did this at what could be

his shareholders' expense

.

That's the kicker here. Companies such as Netflix and

Zynga

(ZNGA) - Get Report

make perfect candidates to go the way of Zipcar, but their CEOs have enough control -- officially or not -- to block an unfriendly party from getting too hostile. While it does not and probably never will require a bailout,

Facebook

(FB) - Get Report

, controlled by Mark Zuckerberg, operates under the same structure.

If Hastings cares about his company and the future of Netflix as

the

streaming pioneer, he'll back off like the Zipcar founders did a long time ago. They let corporate executives take over and then make the right move, which, in this case, was giving up independence.

This doesn't mean, however, that Zipcar must cease being a start-up.

Follow @rocco_thestreet

-- Written by Rocco Pendola in Santa Monica, Calif.

Rocco Pendola is

TheStreet's

Director of Social Media. Pendola's daily contributions to

TheStreet

frequently appear on

CNBC

and at various top online properties, such as

Forbes

.