It think this will grow as a problem, as many regional and even national sites are rarely well made UI/UX-wise, just take a look at the Norwegian Artsobservasjoner - it is painfully outdated, and I only use it in “emergencies”.
It appears that many are unable to understand the scope and goal of our work - it is for the life of our planet, not for personal agendas or career goals. I have suggested for ages that they update from a 1990s UI to current best practices, and strongly advised them to look into iNat. Just utter silence, and no change.
I find iNat the leader in so many ways, and the natural path is not to spend lots of money on locally developed sites, but instead focus on content, and let iNat be the global interface to accessing those data.
I also think that these regional sites more and more will realize that the go-to place is iNat, as more and more data is uploaded there and not their regional sites.
I for one will only upload my observations on iNat and my personal blog.