If, as a customer, you don't like what Dropbox, Google, Microsoft etc. are doing, then cast your economic vote and don't use the one product that represents the bulk of their revenue. Most companies earn most of their money from one, maybe two, products (focus on not using those). For Google, don't waste time with email, focus on search...and so on.

Google: Search Microsoft: Office Dropbox: File sync/sharing etc.

You don't have to go cold turkey, but it's easy enough to switch one at a time. Help other people (friends/family/etc.) to switch as well. Big changes happen one person at a time.

More importantly, you will see change if a major corporation sees a threat to their revenues.

Cast your economic vote. Repeat. Encourage others to do so as well.