You are still incorrect.
Take the issue up with eBay or PayPal as you clearly do not understand the policies.
"Proof of delivery indicates that the item was delivered to the recipient, and generally comes in the form of an online tracking number. It shows the city, state, and zip to which the package was shipped, the date the package was delivered, and its delivery status. For payments of $250 USD or more, a signature confirmation of receipt is also required. The proof of delivery doesn't need to show the full street address since some shipping companies don't include this information. The city and state or zip code (or equivalent) is normally acceptable."
"a. Risk-Based Holds. PayPal, in its sole discretion, may place a hold on any or all of the payments you receive when PayPal believes there may be a high level of risk associated with you, your Account, or any or all of your transactions. PayPal’s determination may be based on a number of different factors and PayPal may rely on information it receives from its third party partners such as eBay. If PayPal places a hold on a payment, the funds will appear in your “Pending Balance” and the payment status will show as “Completed - Funds not yet available”. If PayPal places a hold on any or all of the payments you receive PayPal will provide you with notice of our actions. PayPal will release the hold on any payment after 21 Days from the date the payment was received into your Account unless you receive a Dispute, Claim, Chargeback, or Reversal or PayPal has taken another action permitted under this Section 10. PayPal, in its sole discretion, may release the hold earlier under certain circumstances, for example PayPal may release the hold earlier if you have uploaded tracking information. If you receive a Dispute, Claim, Chargeback, or Reversal, PayPal may continue holding the payment in your Account until the matter is resolved pursuant to this Agreement. "
This is not the place to debate eBay/PayPal policy. Ebay and PayPal have boards where you can do that. or you can call customer support of either of those companies.
If you choose not to follow eBay/PayPal requirements then you have that option but you will not be printing those labels on eBay PayPal or Auctiva to do it.... As they only print labels that meet their requirements and services offered by USPS/UPS/etc.
And once again FC letters do not have tracking, USPS does not offer "tracking" for FC letters anyway so this is a moot point. You are arguing for the sake of arguing.
You are not forced to do anything. Go to the PO and buy stamps and don't send your items with tracking.....your choice...your consequences.