We have recently developed a Magneto 2 based website & the developer we used has stopped working on Magneto 2 because of the ongoing costs involved with Magento 2 & is saying companies are now changing to Bigcommerce & Shopifi. Is this correct & should we need to change considering the costs involved with the first development & then the costs to change over?
This is a questions that depends your business requirements. Shopify and other hosted solutions certainly reduce overhead in managing your own storefront, but there are limitations. If your business isn't structured around a traditional product sales model then you may require customizations beyond what Shopify or BigCommerce can offer.
If you'd like to talk more about your options to get a better idea on what the eCommerce landscape is like and what solutions would suit your model, I'd be happy to set up a call.