...How?

3 people / 75k = 25k per person. At a reasonable 100k/year earning potential, that means that 75k a year is 3 months of time?

You pay yourself what you need to survive and use the rest to re-invest in the company, extend the runway, do marketing, etc.

You can't walk away from your day job at $BIGCO, start your own company and expect to get paid like you used to, it doesn't work like that (at least at the beginning).

Your pay is having a large % ownership in (what you think will be) a valuable company down the line.

It seems kinda wild to suggest a fair deal is making ever so slightly above minimum wage for an already established team, company, product, userbase, no?

My issue, I guess, is not with salary, but moreso the value add. 75k does not seem like enough to A.) Live on, really, B.) Extend runway, really, C.) "Fix the internet", really. I can understand trading in cash for agency, I would absolutely do it. But this doesn't really seem like that either, given that presumably lots of founders would need to either seek further funding or work second jobs.

I don't think you'd go for this if you're an already established company. 75k is for 1-2 people who have probably launched less than 6 months ago or are launching with that money.

It's also not just the money. It's credibility by being invested in mozilla (and an investor who is invested in you having more successful funding rounds), it's the marketing and hype that come with it, it's the opportunities to employ people, it's the connections that come from being acquainted with investors and a tech giant, etc.