Vague or all-encompassing data collection
Watch for policies that collect 'information about your device and activity' or reserve the right to gather data 'including but not limited to' a long list. The broader and vaguer the collection, the more of your behavior the company can log, often well beyond what the service needs to work.
Ask for: Look for a specific, purpose-tied list of what is collected, and prefer services that collect only what the feature requires.
Selling or 'sharing' data with third parties
The words to find are 'sell', 'share', 'partners', 'affiliates', and 'for advertising'. Some policies sell your data outright; others 'share' it for targeted ads, which can amount to the same thing. This is where your information becomes someone else's product.
Ask for: Look for a clear 'we do not sell your data' statement, and a way to opt out of sharing for advertising.
Indefinite or undefined retention
A good policy says how long it keeps your data and deletes it when the purpose ends. Watch for 'as long as necessary' with no limit, or retention that continues after you close your account. Data kept forever is data that can leak or be misused years later.
Ask for: Look for defined retention periods and confirmation that your data is deleted when you close your account.
Weak or missing user rights
Strong policies let you access, correct, export, and delete your data, and say how to do it. Watch for policies that grant no rights, hide the delete option, or require a difficult process to exercise them. Rights that are hard to use are barely rights at all.
Ask for: Look for a clear, simple route to access, export, and delete your data, and an account-deletion option you can find.
Broad third-party and tracking disclosures
Most services embed third-party analytics, advertising, and tracking tools that collect data directly. Watch for long lists of unnamed 'service providers', cross-site tracking, and data transfers to other countries with weaker protection.
Ask for: Look for named third parties, a cookie or tracking control, and clarity on where your data is processed.
Unilateral changes with no real notice
Look for clauses that let the company change the policy at any time, with your continued use counting as acceptance. Combined with broad collection, this means the terms you agreed to can quietly become something else.
Ask for: Look for a commitment to notify you of material changes in advance, not just to post an updated date.