There are many reasons why they have stopped accepting bitcoin for their services.

[1] Transaction fees - it was when it was that bitcoin transactions fees are zero (or at least near to zero), now that the price of bitcoin is 10-20k the transaction fees become very expensive too, nobody is interested to pay 50-100+ USD on fees, we know their product prices.

[2] Stability - Bitcoin price is unstable, we undersant when it keeps increasing it's good of course but when it drops to 50% then how they will calculate the profit of the product they sell, or they should hold always the funds with a hope that the price will increase!