Many developers and startups do one or more of those things.
Because trusting large companies that are trusted by many others and have invested in a large infrastructure makes it much more feasible to accomplish their goals. It is possible to trust no one, eg build on the blockchain or freenet, but there is so far much less audience, and it's only recently become feasible to go to marketwith that stuff.
If your goal is to attract millions of customers who can understand how to get started with your technology, trusting large corporations is usually an acceptable tradeoff.
And if you want to be competitive with what's out there using the features of native iOS or AWS or gmail or whatever these services offer that you can't simply get without trusting them, then you HAVE to trust them or users will use another product which did.
Because trusting large companies that are trusted by many others and have invested in a large infrastructure makes it much more feasible to accomplish their goals. It is possible to trust no one, eg build on the blockchain or freenet, but there is so far much less audience, and it's only recently become feasible to go to marketwith that stuff.
If your goal is to attract millions of customers who can understand how to get started with your technology, trusting large corporations is usually an acceptable tradeoff.
And if you want to be competitive with what's out there using the features of native iOS or AWS or gmail or whatever these services offer that you can't simply get without trusting them, then you HAVE to trust them or users will use another product which did.