That's kind of the point: it's completely infeasible to do microtransactions with Ethereum, much less Bitcoin. At time of writing it costs around $23 (!) to do a single ETH transaction.
We can if the network is not full of professional miners. If every user has a practical chance to pack their transaction into a block.
There are several lightning network (payment channel layer on top of bitcoin) paywalls where you can pay 1/10 of a cent to read an article. The tech exists, its now an adoption problem
It’ll be possible with L2 like Optimism which will be out for the public next month.