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.

It’ll be possible with L2 like Optimism which will be out for the public next month.

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

Do it in a state channel or rollup.