... I can't see why uploading ID would be a problem if your not using Bitcoin inappropriately ...
The problem is that it is up to them (with the guidance of the U.S. government) to decide what is appropriate, not you.
For example, here is the official list of activities (supposedly now defunct) which were considered "inappropriate":
Ammunition Sales
Cable Box De-scramblers
Coin Dealers
Credit Card Schemes
Credit Repair Services
Dating Services
Debt Consolidation Scams
Drug Paraphernalia
Escort Services
Firearms Sales
Fireworks Sales
Get Rich Products
Government Grants
Home-Based Charities
Life-Time Guarantees
Life-Time Memberships
Lottery Sales
Mailing Lists/Personal Info
Money Transfer Networks
On-line Gambling
Pawn Shops
Payday Loans
Pharmaceutical Sales
Ponzi Schemes
Pornography
Pyramid-Type Sales
Racist Materials
Surveillance Equipment
Telemarketing
Tobacco Sales
Travel Clubs
Coinbase has a list like this. If they believe you are involved in any activities on their list, they will file a Suspicious Activity Report on you. They might also ban you.