Many types of business can't be bootstrapped. That is not unusual. Bootstrapping is primarily a popular approach now due to easy computer automation that makes a small subset of companies viable with the very small staff and no expensive hardware. It certainly isn't a default across all industries.
The labour pool is a market. You are not entitled to cheap labour just because you want it. If you can't find someone willing to do your work at the rate you want to pay it's because someone else is paying more for the same work, so you need to pay more to attract the labour.
Importing people from abroad is something that only exists as a solution because of the imbalance of development levels around the world right now. I expect that this is an anomaly that we are going to see correct itself in time once all countries reach a similer level of development. Where will you import your cheap labour from then?
In the UK we used to employ children to work in the mines and the mills. This was eventually realised to be exploitative and made illegal. I'd bet that all the business owners at the time complained how would they ever be profitable without the cheap child labour. But they either adjust or die, and I'm happy with that tradeoff. If a business is only viable with child labour I would prefer it didn't exist at all.
This has never been the case in the past; there is no reason to expect it in the future.
It’s all a matter of degree. Degree of progress, degree of wage difference, etc.
Not in terms of travel distance or the speed of human movement (remember when "around the world in 80 days" was an actual accomplishment, worthy of fantasizing about?)
That said some African countries are actually doing rather well. Botswana has seen real economic growth ranking in the top in terms of GDP PPP, just ahead of China, and that's without oil.
PS: Africa's population density is also much lower due to war and corruption. Overall, it's 1.216 billion over 11.73 million mi² vs say 1.339 billion in India in 1.269 million mi² so about 10x the population density. China at 1.386 billion over 3.705 million mi² is again 5x Africa
Also the improvement of economic conditions in some parts of the world will mean competition for labour globally.
Job creation comes after the business has become self-sustaining.
I always think that you should account a startup as though you are going to be paying everyone properly even when you cannot, and then start to pay out based on a combination of need and who has the oldest outstanding credit, when money starts to appear.
If you do this, then your company accounts are actually useful documents that you can project costs off going forward and actually attract investment, rather than living in some optimistic dreamland where the numbers you have do not represent anything like the actual costs of running the business properly.
So they are saying you should do slave-labor? I hope they expected to give you plenty of equity (which is cheap as the company is worthless as there is no money being made yet), otherwise it would be idiotic to expect people to work without compensation.
The only way this payment structure can be morally sound is by treating every unpaid employee as a founder and giving them an equal share of the company.
Historically, there were slaves.