I have never seen a hold to continue before, I thought it was a weird decision too

Has the increase in conversion been A/B tested thoroughly? The increase could have been caused by other things

It's especially more useful on mobile devices

Previously the user had to click two things, the Terms of Service acceptance and then the continue button, which was not quick to do on Mobile

Now they can simply use the old to continue button for 0.5s to proceed with the purchase, which is a known action used by other providers for these cases

We've only seen an increase of conversion/checkout whilst introducing this, have you received any reports from your customers?

I'm with Jan Křenek, and as he said this new update is not a good feature and it only makes the checkout process less convenient for the customers and the customer may abandoned the checkout because he may not understand how to hold, especially on Mobile devices. I hope you return it back to only continue button with one click to make checkout easier. Thank you Sellix team for listening to our suggestions.