An international $100,000 transaction on Paypal would cost a hundred times more than a bitcoin onchain transaction of equal value.
“Transferring abroad $100,000 in $BTC through the Blockchain: fees of $5-50.
Transferring abroad $100,000 of value through Paypal: fees of $1,500-4,000 + PayPal is able to lock the amount for some period”.
In other words, the ratio between the two averages for an international transaction would be about one hundred times. In addition, the cost of a bitcoin onchain transaction does not depend on the amount, therefore it becomes smaller in percentage as the amount sent with the transaction itself increases.
In contrast, on PayPal, the cost of the transaction depends on the amount, so it increases as the amount increases.
PayPal also has a fixed minimum cost for each business transaction, regardless of the amount or country of destination, so it has no competitive costs, for example, for microtransactions.
Even bitcoin onchain transactions have fees that do not make it competitive for microtransactions, but thanks to Lightning Network, which does not require the recording of all transactions on the blockchain, BTC becomes very convenient even in the case of microtransactions, thanks to low costs.
PayPal remains extremely competitive for non-commercial transfers from one account to another in the same currency, as in these cases there are no commission costs.
However, as Michaël also points out, PayPal is a centralised system, allowing it to block, delay or prevent the transfer of funds to certain blacklisted countries for example.
Bitcoin, on the other hand, is a decentralised system in which transactions are in no way censurable or stoppable.