Why would I trust a cryptocurrency that allow only 3 transactions/s?

I noticed the last blocks that are mined every 10 minutes encompass no more than 2k transactions. The bitcoin cryptocurrency allow no more than 2000/10*60=3.5 transactions per second which is very low in comparaison with PayPal or any credit card company.

The 1Mb per block is already reached among most blocks, so the bitcoin is already saturated in terms of transactions per minutes.

Why should I invest in such service and why is the bitcoin price still increasing?

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